By , February 2, 2018 5:16 PM
(1) Wiping your cache partition
    1. If you are not able to access the settings menu (such as when the device hangs when updating), use Recovery mode:
    2. If your device is on, hold the Power button to restart the device.
    3. When the device turns off, press and hold the Volume Down button, then press and hold the Power button at the same time until the tablet turns on.
  • Press the Volume Down button twice to highlight Recovery mode.
  1. Press the Power button to start Recovery mode. You’ll see an image of an Android robot with a red exclamation mark and the words “No command.”
  2. While holding down the Power button, press the Volume Up button.
  3. Use the volume buttons to scroll to “wipe cache partition” then press the Power button to select it.
  4. When the cache is cleared, press the Power button on “reboot system now.”
(2) Factory Reset in Recovery Mode (Hard reset)

  1. If your phone/tablet is ON, turn it OFF. (long press power until it turns off)
  2. Press & hold the Volume Down button, and then press & hold the Power button simultaneously until the phone turns on. You’ll see the word “Start” with an arrow drawn around it.
  3. Press the Volume Down button twice to highlight Recovery mode.
  4. Press the Power button to start Recovery mode. You’ll see an image of an Android robot with a red exclamation mark.
  5. While holding the Power button, tap the Volume Up button.
  6. Use the volume buttons to scroll to “wipe data/factory reset” and press the Power button to select it.
  7. Scroll down to “Yes – erase all user data” and press the Power button to select it.

If things get really squirrelly and your bootloader’s unlocked, no worries — you can flash a whole new image. And if none of the above applies, well, RMA that sucker. And let folks know you did so.



and then

First, make sure that your computer is communicating correctly with your phone or tablet. As long as your device’s serial number comes back as a connected device you are ready to begin updating your device.

./fastboot devices

Now it is time to flash the updated bootloader with the following command.

./fastboot flash bootloader [bootloader file].img

You will not see anything on the screen of your device but there should be a dialog in your terminal or command prompt. When it is done flashing the bootloader you should reboot back into the bootloader as to make sure everything is still working correctly.

./fastboot reboot-bootloader

Next you flash the updated radios. This step is only necessary if you are updating the firmware of a phone or tablet that has cellular radios built into it.

./fastboot flash radio [radio file].img

./fastboot reboot-bootloader

Finally, it’s time to flash the actual system image to your phone or tablet.

Warning: The following line of code will wipe your device. If you do **not* want your device to be wiped, remove the “-w” from the command. The update should still take just fine, and it will not wipe your user data.

./fastboot -w update [image file].zip

When this is done, your phone will restart itself and boot up normally. As this process clears all data from your device, it will take slightly longer for your device to boot up for the first time. Once you have been greeted with the device setup walkthrough process, you know you have successfully flashed a new version of the firmware.

If you do not want to enter the commands manually there are scripts included inside the compressed folder containing the system image that will do most but not all of the heavy lifting for you. The flash-all script files will automate the flashing of the bootloader, radios (if needed), and the system image. The problem with this process is that you must first make sure that your phone is in the bootloader menu and its bootloader must be unlocked before starting the script. Of course, if these are not already done the script will fail to run and nothing will happen.

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Thomas Challenger Thomas Challenger