Unlock Bootloader On Nexus Android Devices.

Before attempting this guide to unlock your bootloader, please note that this is intended for Android phone with STOCK ANDROID OS ONLY. We will be using a Google Nexus One as our reference because it comes with zero user interface alteration from it’s manufacturer. If you are looking to unlock bootloaders on handsets which already have a custom UI from manufacturers installed like HTC Sense, Samsung TouchWiz etc, then this guide won’t be applicable.

1. The first step is download and install Android SDK.

2. Once you are done with downloading and installing SDK, turn off your device and boot in bootloader mode:

• On Nexus One, press and hold the power button and trackball.
• On Nexus S, press and hold the volume-up and power buttons.
• On Galaxy Nexus, press and hold volume-up, volume-down and power buttons.
• On Nexus 4, press and hold volume-down and power buttons.
• On Nexus 7, press and hold volume-down and power buttons.
• On Nexus 10, press and hold volume-up, volume-down and power buttons.

3. Connect your device to your PC via USB and wait till any drivers are installed, which should happen automatically.

4. Now go to command prompt / terminal interface on your computer and type following command:

fastboot oem unlock

5. Once this is done, your phone will show a screen that will prompt you regarding unlocking bootloader. Read through the instructions carefully and confirm by pressing volume up button followed by the power button.