The picture above was taken by Alexei Watson who states that the new stock recovery in Android L has a few new features. You can now Reboot to Bootloader, and Power down.

Compared to the popular third-party alternatives, Android's stock recovery has always been pretty...weak. Makes sense, because it's not really meant to do all the stuff that ROM flasher ...

If you want to unlock your phone’s bootloader, then you’re in great luck–we have a step-by-step guide on how to unlock the Galaxy Nexus’ bootloader.

Weâ ll use ADB commands to reboot into fastboot mode and verify the bootloader status. Fastboot is a bootloader mode in Android that lets you check the bootloader state, among other things.

First off, the bootloader isn't part of Android, it's what lets the device boot into Android. Device manufacturers generally want you to stick to the version of Android they preloaded on the device.

Despite the risks you take, an unlocked bootloader is the first step in being able to fully customize your Nexus 10. This guide shows you how to unlock or relock the Nexus 10 bootloader.

fastboot reboot-bootloader Flash the recovery, boot, system, and vendor images (vendor only applies to some devices): fastboot flash recovery recovery.img fastboot flash boot boot.img ...

Simple guide to boot OnePlus 2 into fastboot or recovery mode and perform a factory reset.