feat: downgrade

.vscode/settings.json

@@ -10,5 +10,5 @@
     ]
   },
   "git.ignoreLimitWarning": true,
-  "cmake.sourceDirectory": "/workspaces/kvm-static-ip/internal/native/cgo"
+  "cmake.sourceDirectory": "/workspaces/kvm-sleep-mode/internal/native/cgo"
 }

internal/ota/app.go

@@ -34,7 +34,7 @@ func (s *State) updateApp(ctx context.Context, appUpdate *componentUpdateStatus)
 	downloadFinished := time.Now()
 	appUpdate.downloadFinishedAt = downloadFinished
 	appUpdate.downloadProgress = 1
-	s.onProgressUpdate()
+	s.triggerStateUpdate()
 
 	if err := s.verifyFile(
 		appUpdatePath,
@@ -48,7 +48,7 @@ func (s *State) updateApp(ctx context.Context, appUpdate *componentUpdateStatus)
 	appUpdate.verificationProgress = 1
 	appUpdate.updatedAt = verifyFinished
 	appUpdate.updateProgress = 1
-	s.onProgressUpdate()
+	s.triggerStateUpdate()
 
 	l.Info().Msg("App update downloaded")
 

internal/ota/ota.go

@@ -21,22 +21,45 @@ func (s *State) GetReleaseAPIEndpoint() string {
 	return s.releaseAPIEndpoint
 }
 
-func (s *State) fetchUpdateMetadata(ctx context.Context, deviceID string, includePreRelease bool) (*UpdateMetadata, error) {
+// getUpdateURL returns the update URL for the given parameters
-	metadata := &UpdateMetadata{}
+func (s *State) getUpdateURL(params UpdateParams) (string, error) {
-
 	updateURL, err := url.Parse(s.releaseAPIEndpoint)
 	if err != nil {
-		return nil, fmt.Errorf("error parsing update metadata URL: %w", err)
+		return "", fmt.Errorf("error parsing update metadata URL: %w", err)
+	}
+
+	appTargetVersion := s.GetTargetVersion("app")
+	if appTargetVersion != "" && params.AppTargetVersion == "" {
+		params.AppTargetVersion = appTargetVersion
+	}
+	systemTargetVersion := s.GetTargetVersion("system")
+	if systemTargetVersion != "" && params.SystemTargetVersion == "" {
+		params.SystemTargetVersion = systemTargetVersion
 	}
 
 	query := updateURL.Query()
-	query.Set("deviceId", deviceID)
+	query.Set("deviceId", params.DeviceID)
-	query.Set("prerelease", fmt.Sprintf("%v", includePreRelease))
+	query.Set("prerelease", fmt.Sprintf("%v", params.IncludePreRelease))
+	if params.AppTargetVersion != "" {
+		query.Set("appVersion", params.AppTargetVersion)
+	}
+	if params.SystemTargetVersion != "" {
+		query.Set("systemVersion", params.SystemTargetVersion)
+	}
 	updateURL.RawQuery = query.Encode()
 
-	logger.Info().Str("url", updateURL.String()).Msg("Checking for updates")
+	return updateURL.String(), nil
+}
 
-	req, err := http.NewRequestWithContext(ctx, "GET", updateURL.String(), nil)
+func (s *State) fetchUpdateMetadata(ctx context.Context, params UpdateParams) (*UpdateMetadata, error) {
+	metadata := &UpdateMetadata{}
+
+	url, err := s.getUpdateURL(params)
+	if err != nil {
+		return nil, fmt.Errorf("error getting update URL: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
 	if err != nil {
 		return nil, fmt.Errorf("error creating request: %w", err)
 	}
@@ -61,38 +84,49 @@ func (s *State) fetchUpdateMetadata(ctx context.Context, deviceID string, includ
 	return metadata, nil
 }
 
-func (s *State) TryUpdate(ctx context.Context, deviceID string, includePreRelease bool) error {
+func (s *State) TryUpdate(ctx context.Context, params UpdateParams) error {
+	return s.doUpdate(ctx, params)
+}
+
+func (s *State) triggerStateUpdate() {
+	s.onStateUpdate(s.ToRPCState())
+}
+
+func (s *State) doUpdate(ctx context.Context, params UpdateParams) error {
 	scopedLogger := s.l.With().
-		Str("deviceID", deviceID).
+		Interface("params", params).
-		Str("includePreRelease", fmt.Sprintf("%v", includePreRelease)).
 		Logger()
 
-	scopedLogger.Info().Msg("Trying to update...")
+	scopedLogger.Info().Msg("checking for updates")
 	if s.updating {
 		return fmt.Errorf("update already in progress")
 	}
 
 	s.updating = true
-	s.onProgressUpdate()
+	s.triggerStateUpdate()
 
 	defer func() {
 		s.updating = false
-		s.onProgressUpdate()
+		s.triggerStateUpdate()
 	}()
 
-	appUpdate, systemUpdate, err := s.getUpdateStatus(ctx, deviceID, includePreRelease)
+	appUpdate, systemUpdate, err := s.getUpdateStatus(ctx, params)
 	if err != nil {
 		return s.componentUpdateError("Error checking for updates", err, &scopedLogger)
 	}
 
-	s.metadataFetchedAt = time.Now()
+	if params.CheckOnly {
-	s.onProgressUpdate()
+		return nil
+	}
 
-	if appUpdate.available {
+	s.metadataFetchedAt = time.Now()
+	s.triggerStateUpdate()
+
+	if appUpdate.available || appUpdate.downgradeAvailable {
 		appUpdate.pending = true
 	}
 
-	if systemUpdate.available {
+	if systemUpdate.available || systemUpdate.downgradeAvailable {
 		systemUpdate.pending = true
 	}
 
@@ -133,10 +167,18 @@ func (s *State) TryUpdate(ctx context.Context, deviceID string, includePreReleas
 	return nil
 }
 
+// UpdateParams represents the parameters for the update
+type UpdateParams struct {
+	DeviceID            string `json:"deviceID"`
+	AppTargetVersion    string `json:"appTargetVersion"`
+	SystemTargetVersion string `json:"systemTargetVersion"`
+	IncludePreRelease   bool   `json:"includePreRelease"`
+	CheckOnly           bool   `json:"checkOnly"`
+}
+
 func (s *State) getUpdateStatus(
 	ctx context.Context,
-	deviceID string,
+	params UpdateParams,
-	includePreRelease bool,
 ) (
 	appUpdate *componentUpdateStatus,
 	systemUpdate *componentUpdateStatus,
@@ -144,7 +186,14 @@ func (s *State) getUpdateStatus(
 ) {
 	appUpdate = &componentUpdateStatus{}
 	systemUpdate = &componentUpdateStatus{}
-	err = nil
+
+	if currentAppUpdate, ok := s.componentUpdateStatuses["app"]; ok {
+		appUpdate = &currentAppUpdate
+	}
+
+	if currentSystemUpdate, ok := s.componentUpdateStatuses["system"]; ok {
+		systemUpdate = &currentSystemUpdate
+	}
 
 	// Get local versions
 	systemVersionLocal, appVersionLocal, err := s.getLocalVersion()
@@ -155,7 +204,7 @@ func (s *State) getUpdateStatus(
 	systemUpdate.localVersion = systemVersionLocal.String()
 
 	// Get remote metadata
-	remoteMetadata, err := s.fetchUpdateMetadata(ctx, deviceID, includePreRelease)
+	remoteMetadata, err := s.fetchUpdateMetadata(ctx, params)
 	if err != nil {
 		err = fmt.Errorf("error checking for updates: %w", err)
 		return
@@ -175,6 +224,7 @@ func (s *State) getUpdateStatus(
 		return
 	}
 	systemUpdate.available = systemVersionRemote.GreaterThan(systemVersionLocal)
+	systemUpdate.downgradeAvailable = systemVersionRemote.LessThan(systemVersionLocal)
 
 	appVersionRemote, err := semver.NewVersion(remoteMetadata.AppVersion)
 	if err != nil {
@@ -182,15 +232,16 @@ func (s *State) getUpdateStatus(
 		return
 	}
 	appUpdate.available = appVersionRemote.GreaterThan(appVersionLocal)
+	appUpdate.downgradeAvailable = appVersionRemote.LessThan(appVersionLocal)
 
 	// Handle pre-release updates
 	isRemoteSystemPreRelease := systemVersionRemote.Prerelease() != ""
 	isRemoteAppPreRelease := appVersionRemote.Prerelease() != ""
 
-	if isRemoteSystemPreRelease && !includePreRelease {
+	if isRemoteSystemPreRelease && !params.IncludePreRelease {
 		systemUpdate.available = false
 	}
-	if isRemoteAppPreRelease && !includePreRelease {
+	if isRemoteAppPreRelease && !params.IncludePreRelease {
 		appUpdate.available = false
 	}
 
@@ -201,8 +252,8 @@ func (s *State) getUpdateStatus(
 }
 
 // GetUpdateStatus returns the current update status (for backwards compatibility)
-func (s *State) GetUpdateStatus(ctx context.Context, deviceID string, includePreRelease bool) (*UpdateStatus, error) {
+func (s *State) GetUpdateStatus(ctx context.Context, params UpdateParams) (*UpdateStatus, error) {
-	_, _, err := s.getUpdateStatus(ctx, deviceID, includePreRelease)
+	_, _, err := s.getUpdateStatus(ctx, params)
 	if err != nil {
 		return nil, fmt.Errorf("error getting update status: %w", err)
 	}

internal/ota/state.go

@@ -1,6 +1,7 @@
 package ota
 
 import (
+	"fmt"
 	"net/http"
 	"sync"
 	"time"
@@ -27,10 +28,12 @@ type LocalMetadata struct {
 
 // UpdateStatus represents the current update status
 type UpdateStatus struct {
-	Local                 *LocalMetadata  `json:"local"`
+	Local                    *LocalMetadata  `json:"local"`
-	Remote                *UpdateMetadata `json:"remote"`
+	Remote                   *UpdateMetadata `json:"remote"`
-	SystemUpdateAvailable bool            `json:"systemUpdateAvailable"`
+	SystemUpdateAvailable    bool            `json:"systemUpdateAvailable"`
-	AppUpdateAvailable    bool            `json:"appUpdateAvailable"`
+	SystemDowngradeAvailable bool            `json:"systemDowngradeAvailable"`
+	AppUpdateAvailable       bool            `json:"appUpdateAvailable"`
+	AppDowngradeAvailable    bool            `json:"appDowngradeAvailable"`
 
 	// for backwards compatibility
 	Error string `json:"error,omitempty"`
@@ -47,8 +50,10 @@ type PostRebootAction struct {
 type componentUpdateStatus struct {
 	pending              bool
 	available            bool
+	downgradeAvailable   bool
 	version              string
 	localVersion         string
+	targetVersion        string
 	url                  string
 	hash                 string
 	downloadProgress     float32
@@ -79,6 +84,8 @@ type RPCState struct {
 	AppUpdatedAt               time.Time `json:"appUpdatedAt,omitempty"`
 	SystemUpdateProgress       float32   `json:"systemUpdateProgress,omitempty"` //TODO: port rk_ota, then implement
 	SystemUpdatedAt            time.Time `json:"systemUpdatedAt,omitempty"`
+	SystemTargetVersion        string    `json:"systemTargetVersion,omitempty"`
+	AppTargetVersion           string    `json:"appTargetVersion,omitempty"`
 }
 
 // HwRebootFunc is a function that reboots the hardware
@@ -109,6 +116,40 @@ type State struct {
 	client                  GetHTTPClientFunc
 	reboot                  HwRebootFunc
 	getLocalVersion         GetLocalVersionFunc
+	onStateUpdate           OnStateUpdateFunc
+}
+
+// SetTargetVersion sets the target version for a component
+func (s *State) SetTargetVersion(component string, version string) error {
+	parsedVersion := version
+	if version != "" {
+		// validate if it's a valid semver string first
+		semverVersion, err := semver.NewVersion(version)
+		if err != nil {
+			return fmt.Errorf("not a valid semantic version: %w", err)
+		}
+		parsedVersion = semverVersion.String()
+	}
+
+	// check if the component exists
+	componentUpdate, ok := s.componentUpdateStatuses[component]
+	if !ok {
+		return fmt.Errorf("component %s not found", component)
+	}
+
+	componentUpdate.targetVersion = parsedVersion
+	s.componentUpdateStatuses[component] = componentUpdate
+
+	return nil
+}
+
+// GetTargetVersion returns the target version for a component
+func (s *State) GetTargetVersion(component string) string {
+	componentUpdate, ok := s.componentUpdateStatuses[component]
+	if !ok {
+		return ""
+	}
+	return componentUpdate.targetVersion
 }
 
 // ToUpdateStatus converts the State to the UpdateStatus
@@ -136,9 +177,11 @@ func (s *State) ToUpdateStatus() *UpdateStatus {
 			SystemURL:     systemUpdate.url,
 			SystemHash:    systemUpdate.hash,
 		},
-		SystemUpdateAvailable: systemUpdate.available,
+		SystemUpdateAvailable:    systemUpdate.available,
-		AppUpdateAvailable:    appUpdate.available,
+		SystemDowngradeAvailable: systemUpdate.downgradeAvailable,
-		Error:                 s.error,
+		AppUpdateAvailable:       appUpdate.available,
+		AppDowngradeAvailable:    appUpdate.downgradeAvailable,
+		Error:                    s.error,
 	}
 }
 
@@ -160,12 +203,17 @@ type Options struct {
 
 // NewState creates a new OTA state
 func NewState(opts Options) *State {
+	components := make(map[string]componentUpdateStatus)
+	components["app"] = componentUpdateStatus{}
+	components["system"] = componentUpdateStatus{}
+
 	s := &State{
 		l:                       opts.Logger,
 		client:                  opts.GetHTTPClient,
 		reboot:                  opts.HwReboot,
+		onStateUpdate:           opts.OnStateUpdate,
 		getLocalVersion:         opts.GetLocalVersion,
-		componentUpdateStatuses: make(map[string]componentUpdateStatus),
+		componentUpdateStatuses: components,
 		releaseAPIEndpoint:      opts.ReleaseAPIEndpoint,
 	}
 	go s.confirmCurrentSystem()
@@ -189,6 +237,7 @@ func (s *State) ToRPCState() *RPCState {
 		r.AppVerifiedAt = app.verifiedAt
 		r.AppUpdateProgress = app.updateProgress
 		r.AppUpdatedAt = app.updatedAt
+		r.AppTargetVersion = app.targetVersion
 	}
 
 	system, ok := s.componentUpdateStatuses["system"]
@@ -200,10 +249,8 @@ func (s *State) ToRPCState() *RPCState {
 		r.SystemVerifiedAt = system.verifiedAt
 		r.SystemUpdateProgress = system.updateProgress
 		r.SystemUpdatedAt = system.updatedAt
+		r.SystemTargetVersion = system.targetVersion
 	}
 
 	return r
 }
-
-func (s *State) onProgressUpdate() {
-}

internal/ota/sys.go

@@ -24,7 +24,7 @@ func (s *State) updateSystem(ctx context.Context, systemUpdate *componentUpdateS
 	downloadFinished := time.Now()
 	systemUpdate.downloadFinishedAt = downloadFinished
 	systemUpdate.downloadProgress = 1
-	s.onProgressUpdate()
+	s.triggerStateUpdate()
 
 	if err := s.verifyFile(
 		systemUpdatePath,
@@ -38,7 +38,7 @@ func (s *State) updateSystem(ctx context.Context, systemUpdate *componentUpdateS
 	systemUpdate.verificationProgress = 1
 	systemUpdate.updatedAt = verifyFinished
 	systemUpdate.updateProgress = 1
-	s.onProgressUpdate()
+	s.triggerStateUpdate()
 
 	l.Info().Msg("System update downloaded")
 
@@ -68,7 +68,7 @@ func (s *State) updateSystem(ctx context.Context, systemUpdate *componentUpdateS
 				if systemUpdate.updateProgress > 0.99 {
 					systemUpdate.updateProgress = 0.99
 				}
-				s.onProgressUpdate()
+				s.triggerStateUpdate()
 			case <-ctx.Done():
 				return
 			}
@@ -86,7 +86,7 @@ func (s *State) updateSystem(ctx context.Context, systemUpdate *componentUpdateS
 	rkLogger.Info().Msg("rk_ota success")
 	systemUpdate.updateProgress = 1
 	systemUpdate.updatedAt = verifyFinished
-	s.onProgressUpdate()
+	s.triggerStateUpdate()
 
 	return nil
 }

internal/ota/utils.go

@@ -82,7 +82,7 @@ func (s *State) downloadFile(ctx context.Context, path string, url string, downl
 			progress := float32(written) / float32(totalSize)
 			if progress-*downloadProgress >= 0.01 {
 				*downloadProgress = progress
-				s.onProgressUpdate()
+				s.triggerStateUpdate()
 			}
 		}
 		if er != nil {
@@ -136,7 +136,7 @@ func (s *State) verifyFile(path string, expectedHash string, verifyProgress *flo
 			progress := float32(verified) / float32(totalSize)
 			if progress-*verifyProgress >= 0.01 {
 				*verifyProgress = progress
-				s.onProgressUpdate()
+				s.triggerStateUpdate()
 			}
 		}
 		if er != nil {

jsonrpc.go

@@ -19,7 +19,6 @@ import (
 	"go.bug.st/serial"
 
 	"github.com/jetkvm/kvm/internal/hidrpc"
-	"github.com/jetkvm/kvm/internal/ota"
 	"github.com/jetkvm/kvm/internal/usbgadget"
 	"github.com/jetkvm/kvm/internal/utils"
 )
@@ -237,71 +236,6 @@ func rpcGetVideoLogStatus() (string, error) {
 	return nativeInstance.VideoLogStatus()
 }
 
-func rpcGetDevChannelState() (bool, error) {
-	return config.IncludePreRelease, nil
-}
-
-func rpcSetDevChannelState(enabled bool) error {
-	config.IncludePreRelease = enabled
-	if err := SaveConfig(); err != nil {
-		return fmt.Errorf("failed to save config: %w", err)
-	}
-	return nil
-}
-
-func getUpdateStatus(includePreRelease bool) (*ota.UpdateStatus, error) {
-	updateStatus, err := otaState.GetUpdateStatus(context.Background(), GetDeviceID(), includePreRelease)
-	// to ensure backwards compatibility,
-	// if there's an error, we won't return an error, but we will set the error field
-	if err != nil {
-		if updateStatus == nil {
-			return nil, fmt.Errorf("error checking for updates: %w", err)
-		}
-		updateStatus.Error = err.Error()
-	}
-
-	logger.Info().Interface("updateStatus", updateStatus).Msg("Update status")
-
-	return updateStatus, nil
-}
-
-func rpcGetUpdateStatus() (*ota.UpdateStatus, error) {
-	return getUpdateStatus(config.IncludePreRelease)
-}
-
-func rpcGetUpdateStatusChannel(channel string) (*ota.UpdateStatus, error) {
-	switch channel {
-	case "stable":
-		return getUpdateStatus(false)
-	case "dev":
-		return getUpdateStatus(true)
-	default:
-		return nil, fmt.Errorf("invalid channel: %s", channel)
-	}
-}
-
-func rpcGetLocalVersion() (*ota.LocalMetadata, error) {
-	systemVersion, appVersion, err := GetLocalVersion()
-	if err != nil {
-		return nil, fmt.Errorf("error getting local version: %w", err)
-	}
-	return &ota.LocalMetadata{
-		AppVersion:    appVersion.String(),
-		SystemVersion: systemVersion.String(),
-	}, nil
-}
-
-func rpcTryUpdate() error {
-	includePreRelease := config.IncludePreRelease
-	go func() {
-		err := otaState.TryUpdate(context.Background(), GetDeviceID(), includePreRelease)
-		if err != nil {
-			logger.Warn().Err(err).Msg("failed to try update")
-		}
-	}()
-	return nil
-}
-
 func rpcSetDisplayRotation(params DisplayRotationSettings) error {
 	currentRotation := config.DisplayRotation
 	if currentRotation == params.Rotation {
@@ -1219,6 +1153,8 @@ var rpcHandlers = map[string]RPCHandler{
 	"getUpdateStatus":        {Func: rpcGetUpdateStatus},
 	"getUpdateStatusChannel": {Func: rpcGetUpdateStatusChannel},
 	"tryUpdate":              {Func: rpcTryUpdate},
+	"tryUpdateComponents":    {Func: rpcTryUpdateComponents, Params: []string{"components", "includePreRelease", "checkOnly"}},
+	"cancelDowngrade":        {Func: rpcCancelDowngrade},
 	"getDevModeState":        {Func: rpcGetDevModeState},
 	"setDevModeState":        {Func: rpcSetDevModeState, Params: []string{"enabled"}},
 	"getSSHKeyState":         {Func: rpcGetSSHKeyState},

main.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/gwatts/rootcerts"
+	"github.com/jetkvm/kvm/internal/ota"
 )
 
 var appCtx context.Context
@@ -107,7 +108,10 @@ func Main() {
 			}
 
 			includePreRelease := config.IncludePreRelease
-			err = otaState.TryUpdate(context.Background(), GetDeviceID(), includePreRelease)
+			err = otaState.TryUpdate(context.Background(), ota.UpdateParams{
+				DeviceID:          GetDeviceID(),
+				IncludePreRelease: includePreRelease,
+			})
 			if err != nil {
 				logger.Warn().Err(err).Msg("failed to auto update")
 			}

ota.go

@@ -1,6 +1,7 @@
 package kvm
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"os"
@@ -74,3 +75,114 @@ func GetLocalVersion() (systemVersion *semver.Version, appVersion *semver.Versio
 
 	return systemVersion, appVersion, nil
 }
+
+func getUpdateStatus(includePreRelease bool) (*ota.UpdateStatus, error) {
+	updateStatus, err := otaState.GetUpdateStatus(context.Background(), ota.UpdateParams{
+		DeviceID:          GetDeviceID(),
+		IncludePreRelease: includePreRelease,
+	})
+	// to ensure backwards compatibility,
+	// if there's an error, we won't return an error, but we will set the error field
+	if err != nil {
+		if updateStatus == nil {
+			return nil, fmt.Errorf("error checking for updates: %w", err)
+		}
+		updateStatus.Error = err.Error()
+	}
+
+	logger.Info().Interface("updateStatus", updateStatus).Msg("Update status")
+
+	return updateStatus, nil
+}
+
+func rpcGetDevChannelState() (bool, error) {
+	return config.IncludePreRelease, nil
+}
+
+func rpcSetDevChannelState(enabled bool) error {
+	config.IncludePreRelease = enabled
+	if err := SaveConfig(); err != nil {
+		return fmt.Errorf("failed to save config: %w", err)
+	}
+	return nil
+}
+
+func rpcGetUpdateStatus() (*ota.UpdateStatus, error) {
+	return getUpdateStatus(config.IncludePreRelease)
+}
+
+func rpcGetUpdateStatusChannel(channel string) (*ota.UpdateStatus, error) {
+	switch channel {
+	case "stable":
+		return getUpdateStatus(false)
+	case "dev":
+		return getUpdateStatus(true)
+	default:
+		return nil, fmt.Errorf("invalid channel: %s", channel)
+	}
+}
+
+func rpcGetLocalVersion() (*ota.LocalMetadata, error) {
+	systemVersion, appVersion, err := GetLocalVersion()
+	if err != nil {
+		return nil, fmt.Errorf("error getting local version: %w", err)
+	}
+	return &ota.LocalMetadata{
+		AppVersion:    appVersion.String(),
+		SystemVersion: systemVersion.String(),
+	}, nil
+}
+
+// ComponentName represents the name of a component
+type tryUpdateComponents struct {
+	AppTargetVersion    string `json:"app"`
+	SystemTargetVersion string `json:"system"`
+}
+
+func rpcTryUpdate() error {
+	return rpcTryUpdateComponents(tryUpdateComponents{
+		AppTargetVersion:    "",
+		SystemTargetVersion: "",
+	}, config.IncludePreRelease, false)
+}
+
+func rpcTryUpdateComponents(components tryUpdateComponents, includePreRelease bool, checkOnly bool) error {
+	updateParams := ota.UpdateParams{
+		DeviceID:          GetDeviceID(),
+		IncludePreRelease: includePreRelease,
+		CheckOnly:         checkOnly,
+	}
+
+	logger.Info().Interface("components", components).Msg("components")
+
+	if components.AppTargetVersion != "" {
+		updateParams.AppTargetVersion = components.AppTargetVersion
+		if err := otaState.SetTargetVersion("app", components.AppTargetVersion); err != nil {
+			return fmt.Errorf("failed to set app target version: %w", err)
+		}
+	}
+	if components.SystemTargetVersion != "" {
+		updateParams.SystemTargetVersion = components.SystemTargetVersion
+		if err := otaState.SetTargetVersion("system", components.SystemTargetVersion); err != nil {
+			return fmt.Errorf("failed to set system target version: %w", err)
+		}
+	}
+
+	go func() {
+		err := otaState.TryUpdate(context.Background(), updateParams)
+		if err != nil {
+			logger.Warn().Err(err).Msg("failed to try update")
+		}
+	}()
+	return nil
+}
+
+func rpcCancelDowngrade() error {
+	if err := otaState.SetTargetVersion("app", ""); err != nil {
+		return fmt.Errorf("failed to set app target version: %w", err)
+	}
+	if err := otaState.SetTargetVersion("system", ""); err != nil {
+		return fmt.Errorf("failed to set system target version: %w", err)
+	}
+	return nil
+}

ui/localization/messages/en.json

@@ -100,18 +100,6 @@
     "advanced_update_ssh_key_button": "Update SSH Key",
     "advanced_usb_emulation_description": "Control the USB emulation state",
     "advanced_usb_emulation_title": "USB Emulation",
-    "advanced_version_update_app_label": "App Version",
-    "advanced_version_update_button": "Update to Version",
-    "advanced_version_update_description": "Install a specific version from GitHub releases",
-    "advanced_version_update_github_link": "JetKVM releases page",
-    "advanced_version_update_helper": "Find available versions on the",
-    "advanced_version_update_system_label": "System Version",
-    "advanced_version_update_target_app": "App only",
-    "advanced_version_update_target_both": "Both App and System",
-    "advanced_version_update_target_label": "What to update",
-    "advanced_version_update_target_system": "System only",
-    "advanced_version_update_title": "Update to Specific Version",
-    "advanced_error_version_update": "Failed to initiate version update: {error}",
     "already_adopted_new_owner": "If you're the new owner, please ask the previous owner to de-register the device from their account in the cloud dashboard. If you believe this is an error, contact our support team for assistance.",
     "already_adopted_other_user": "This device is currently registered to another user in our cloud dashboard.",
     "already_adopted_return_to_dashboard": "Return to Dashboard",
@@ -910,5 +898,21 @@
     "wake_on_lan_invalid_mac": "Invalid MAC address",
     "wake_on_lan_magic_sent_success": "Magic Packet sent successfully",
     "welcome_to_jetkvm": "Welcome to JetKVM",
-    "welcome_to_jetkvm_description": "Control any computer remotely"
+    "welcome_to_jetkvm_description": "Control any computer remotely",
+    "advanced_version_update_app_label": "App Version",
+    "advanced_version_update_button": "Update to Version",
+    "advanced_version_update_description": "Install a specific version from GitHub releases",
+    "advanced_version_update_github_link": "JetKVM releases page",
+    "advanced_version_update_helper": "Find available versions on the",
+    "advanced_version_update_system_label": "System Version",
+    "advanced_version_update_target_app": "App only",
+    "advanced_version_update_target_both": "Both App and System",
+    "advanced_version_update_target_label": "What to update",
+    "advanced_version_update_target_system": "System only",
+    "advanced_version_update_title": "Update to Specific Version",
+    "advanced_error_version_update": "Failed to initiate version update: {error}",
+    "general_update_downgrade_available_description": "A downgrade is available to revert to a previous version.",
+    "general_update_downgrade_available_title": "Downgrade Available",
+    "general_update_downgrade_button": "Downgrade Now",
+    "general_update_keep_current_button": "Keep Current Version"
 }

ui/src/hooks/stores.ts

@@ -554,6 +554,7 @@ export type UpdateModalViews =
   | "updating"
   | "upToDate"
   | "updateAvailable"
+  | "updateDowngradeAvailable"
   | "updateCompleted"
   | "error";
 

ui/src/hooks/useVersion.tsx

@@ -5,6 +5,22 @@ import { JsonRpcError, RpcMethodNotFound } from "@/hooks/useJsonRpc";
 import { getUpdateStatus, getLocalVersion as getLocalVersionRpc } from "@/utils/jsonrpc";
 import notifications from "@/notifications";
 import { m } from "@localizations/messages.js";
+import semver from "semver";
+
+export interface VersionInfo {
+  appVersion: string;
+  systemVersion: string;
+}
+
+export interface SystemVersionInfo {
+  local: VersionInfo;
+  remote?: VersionInfo;
+  systemUpdateAvailable: boolean;
+  systemDowngradeAvailable: boolean;
+  appUpdateAvailable: boolean;
+  appDowngradeAvailable: boolean;
+  error?: string;
+}
 
 export function useVersion() {
   const {

ui/src/routes/devices.$id.settings.advanced.tsx

@@ -182,9 +182,15 @@ export default function SettingsAdvancedRoute() {
   }, [applyLoopbackOnlyMode, setShowLoopbackWarning]);
 
   const handleVersionUpdate = useCallback(() => {
-    // TODO: Add version params to tryUpdate
+    const params = {
-    console.log("tryUpdate", updateTarget, appVersion, systemVersion);
+      components: {
-    send("tryUpdate", {}, (resp: JsonRpcResponse) => {
+        app: appVersion,
+        system: systemVersion,
+      },
+      includePreRelease: devChannel,
+      checkOnly: true,
+    };
+    send("tryUpdateComponents", params, (resp: JsonRpcResponse) => {
       if ("error" in resp) {
         notifications.error(
           m.advanced_error_version_update({ error: resp.error.data || m.unknown_error() })
@@ -194,7 +200,7 @@ export default function SettingsAdvancedRoute() {
       // Navigate to update page
       navigateTo("/settings/general/update");
     });
-  }, [updateTarget, appVersion, systemVersion, send, navigateTo]);
+  }, [updateTarget, appVersion, systemVersion, devChannel, send, navigateTo]);
 
   return (
     <div className="space-y-4">

ui/src/routes/devices.$id.settings.general.update.tsx

@@ -59,16 +59,21 @@ export function Dialog({
 
   const [versionInfo, setVersionInfo] = useState<null | SystemVersionInfo>(null);
   const { modalView, setModalView, otaState } = useUpdateStore();
+  const { send } = useJsonRpc();
 
   const onFinishedLoading = useCallback(
     (versionInfo: SystemVersionInfo) => {
       const hasUpdate =
         versionInfo?.systemUpdateAvailable || versionInfo?.appUpdateAvailable;
+      const hasDowngrade =
+        versionInfo?.systemDowngradeAvailable || versionInfo?.appDowngradeAvailable;
 
       setVersionInfo(versionInfo);
 
       if (hasUpdate) {
         setModalView("updateAvailable");
+      } else if (hasDowngrade) {
+        setModalView("updateDowngradeAvailable");
       } else {
         setModalView("upToDate");
       }
@@ -76,6 +81,11 @@ export function Dialog({
     [setModalView],
   );
 
+  const onCancelDowngrade = useCallback(() => {
+    send("cancelDowngrade", {});
+    onClose();
+  }, [onClose, send]);
+
   return (
     <div className="pointer-events-auto relative mx-auto text-left">
       <div>
@@ -98,6 +108,13 @@ export function Dialog({
             versionInfo={versionInfo!}
           />
         )}
+        {modalView === "updateDowngradeAvailable" && (
+          <UpdateDowngradeAvailableState
+            onConfirmUpdate={onConfirmUpdate}
+            onCancelDowngrade={onCancelDowngrade}
+            versionInfo={versionInfo!}
+          />
+        )}
 
         {modalView === "updating" && (
           <UpdatingDeviceState
@@ -410,6 +427,46 @@ function UpdateAvailableState({
   );
 }
 
+function UpdateDowngradeAvailableState({
+  versionInfo,
+  onConfirmUpdate,
+  onCancelDowngrade,
+}: {
+  versionInfo: SystemVersionInfo;
+  onConfirmUpdate: () => void;
+  onCancelDowngrade: () => void;
+}) {
+  return (
+    <div className="flex flex-col items-start justify-start space-y-4 text-left">
+      <div className="text-left">
+        <p className="text-base font-semibold text-black dark:text-white">
+          {m.general_update_downgrade_available_title()}
+        </p>
+        <p className="mb-2 text-sm text-slate-600 dark:text-slate-300">
+          {m.general_update_downgrade_available_description()}
+        </p>
+        <p className="mb-4 text-sm text-slate-600 dark:text-slate-300">
+          {versionInfo?.systemDowngradeAvailable ? (
+            <>
+              <span className="font-semibold">{m.general_update_system_type()}</span>: {versionInfo?.remote?.systemVersion}
+              <br />
+            </>
+          ) : null}
+          {versionInfo?.appDowngradeAvailable ? (
+            <>
+              <span className="font-semibold">{m.general_update_application_type()}</span>: {versionInfo?.remote?.appVersion}
+            </>
+          ) : null}
+        </p>
+        <div className="flex items-center justify-start gap-x-2">
+          <Button size="SM" theme="primary" text={m.general_update_downgrade_button()} onClick={onConfirmUpdate} />
+          <Button size="SM" theme="light" text={m.general_update_keep_current_button()} onClick={onCancelDowngrade} />
+        </div>
+      </div>
+    </div>
+  );
+}
+
 function UpdateCompletedState({ onClose }: { onClose: () => void }) {
   return (
     <div className="flex flex-col items-start justify-start space-y-4 text-left">