Installing custom OS on original Nexus 7 (2012)

Before starting, make sure you have working adb (Android Development Bridge) tool on your PC. adb.exe is part of Android SDK, so if you have Android Studio, you should already have adb. If not, you can download Android Studio (or SDK only) from

Warning: following instructions below will wipe all data on your tablet.

Step 1 - Unlock bootloader 

  • Enable USB Debugging on Nexus 7. Settings > Developer Options > USB Debbuging
    Developers Options by default are disabled on all Android tablets. To enable them, got to Settings > About tablet and tap multiple times on Build Number
  • Connect Nexus 7 to your PC with USB cable. When you get a prompt "Allow USB debugging" choose OK.
  • Open command prompt and navigate to the location of adb.exe.
    Exact path where the file is located depends on where you installed Android SDK. i.e. D:\sdk\platform-tools
  • Run command adb reboot bootloader
    Nexus 7 should reboot into FastBoot mode.
  • Run command fastboot oem unlock. Accept a warring on the device.
  • Nexus 7 should now have bootloader unlocked.

Root failure - Firmware upgrade encountered an issue


Trying to root Samsung Galaxy Note 3 using Kingo Root failed. The phone doesn't boot and only displays following message when turned on:

Firmware upgrade encountered an issue. Please select recovery mode in Kies & try again.

Recovery attempt in Samsung Kies failed. Re-flash full Samsung firmware via Odin also failed.


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