If you are a developer, you would most probably like to unlock bootloader of Nexus 7 tablet, or even root it.
Here I list the steps to unlock the bootloader.
It is assumed that you already have the Android SDK installed on your computer,
the tools, such adb, fastboot, are available. Please note that by unlocking the bootloader of your
Nexus 7 tablet, your data would be lost. Please back up your data before unlocking your tablet.
1. Make sure adb could see the Nexus 7 tablet when you connect it to PC using the included cable in the box. From the DOS command prompt, you can use the command "adb devices" to check if it is available. If it is not available on the output list of adb command, please follow the instructions to install drivers to the computer.
2. Boot the tablet into bootloader mode. You can run the command "adb reboot rebootloader" in the DOS command prompt. Please check the text at the left lower corner. If it says "Lock State - Unlocked", the bootloader of your Nexus 7 tablet has already been unlocked; otherwise, it would say "Lock State - Locked".
3. On your computer, please run "fastboot oem unlock" in the DOS prompt.
4. On your Nexus 7 tablet, please read the warnings on the screen and use the volume button on the right side of the tablet to navigate and choose "Yes" or "No", and use the power button to select and proceed.
5. On your computer, in the DOS prompt where you ran the "fastboot oem unlock" command, you will see the progress.
6. After it is done, please use the volume button on the right side of your Nexus 7 tablet to restart the device, or run "fastboot reboot" in the DOS prompt on your computer.
7. On your tablet, you will notice that the tablet is rebooting, and at the bottom of the screen,
you will see there is a lock and it is unlock, indicating your Nexus 7 tablet is unlocked.
8. Now you may proceed to the setting process.
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