Android phones have a recovery mode that lets you access the bootloader and wipe data if you're unable to normally boot your phone.

Still, the stock recovery in Android M is a little more capable than before. There appear to be three new options in the recovery menu: apply update from SD card, mount /system, and view recovery ...

If your Android device is stuck in Recovery mode, you can perform a hardware master reset to get out of the Recovery menu loop.

With L's Android release, the recovery is getting a little bit more useful with two new options: reboot to bootloader and power down.

Master Android recovery mode with our simple guide. Learn to troubleshoot, reset, and restore your device for peak performance.