diff --git a/hw.go b/hw.go
index 505ff698..eb68da11 100644
--- a/hw.go
+++ b/hw.go
@@ -31,14 +31,6 @@ func extractSerialNumber() (string, error) {
 	return matches[1], nil
 }
 
-func readOtpEntropy() ([]byte, error) { //nolint:unused
-	content, err := os.ReadFile("/sys/bus/nvmem/devices/rockchip-otp0/nvmem")
-	if err != nil {
-		return nil, err
-	}
-	return content[0x17:0x1C], nil
-}
-
 func hwReboot(force bool, postRebootAction *ota.PostRebootAction, delay time.Duration) error {
 	logger.Info().Dur("delay", delay).Msg("reboot requested")