Manually Performing Recovery Operations

Besides manual recovery options, the Android phones also feature an independent, automatic problem detection and recovery attempt capability that can culminate in recovery mode or in switching image slots. Android phones also feature a ‘hardware watchdog’. This feature resets the phone if Android is stacked and doesn’t respond (though Android stacking is unlikely); there’s no recovery process; the phone is only reset.

While a device is powering up, you can perform recovery operations by long-pressing the device’s reset key.

When long-pressing the reset key, the device’s main LED changes color after every n seconds; each color is aligned with a recovery operation option.