Flash a Factory Image, and Return to Stock Nexus 9

Flash a Factory Image, and Return to Stock Nexus 9

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Flash a Factory Image, and Return to Stock Nexus 9


How To Unlock the Bootloader
  1. If you don’t have developer options enabled on your device go to settings, about device and tap on the build number 7 times.
  2. In settings, developer options enable oem unlock
  3. Now you get to use fastboot! Boot you device into the bootloader, vol up + power with your device shut off. Once booted into the bootloader connect it to your PC with the usb cable and open a command window on your PC. Once connected type the following command in the cmd window:
  4. fastboot devices (Your device serial number should show up and this will ensure fastboot is working properly)

Then type:

fastboot oem unlock (This will unlock the bootloader and you’re now good to go)
NOTE, UNLOCKING THE BOOTLOADER DOES WIPE YOUR DEVICE SO BACKUP OFF YOUR DEVICE FIRST

How To Flash the Factory Image, SHORT METHOD
  1. Open a command window on your PC in the same directory as you extracted the factory image. In that directory shift, right click in an open area and use “Open a command window here”
  2. Boot your device into the bootloader and connect it to your PC. Then simply double click on the flash-all batch file. Note that there are batch files in there that will work for Windows as well as Linux machines
  3. Let the batch file run and when it’s done you’ll be back to stock.
  4. NOTE THAT FLASHING BY THIS METHOD DOES WIPE YOUR DEVICE SO MAKE SURE YOU BACKUP OFF YOUR DEVICE FIRST.

How To Flash the Factory Image, LONG METHOD

In this method each factory image is flashed separately. This should be used if you have problems with the short method and as you get more familiar with fastboot you’ll be able to flash only the images that you need for your specific requirement. For instance, you might want to only flash the stock recovery if you’re trying to take an ota and you’ve installed a custom recovery. The order that you flash the images is not important. 

In the folder you extracted the factory image it’s easiest if you re-name the bootloader image file to simply bootloader and radio. Then open a Windows command window in that folder and use the fastboot commands:

fastboot flash bootloader bootloader.img
fastboot reboot-bootloader

fastboot –w (NOTE, this command does wipe your device. It’s possible to flash the factory image without this command but if you’re going from different revision numbers of android it’s highly recommend to wipe the device)


Now open a Windows command window in the same folder that you extracted the zip file in, the one where you find recovery, system, etc. Then run the fastboot commands:

  1. fastboot flash boot boot.img
  2. fastboot flash cache cache.img
  3. fastboot flash recovery recovery.img
  4. fastboot flash system system.img [Note, flashing system takes a long time, so let it do it's thing]
  5. fastboot flash vendor vendor.img

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