Clearing eMMC

Before proceeding with these steps it is important that any buttons on the target device that are required to Boot from USB are tested. If the required buttons are non-functional and the eMMC is cleared the device will become unrecoverable until the required buttons are repaired.

This will permanently delete ALL data stored on the device. This includes any operating system installation, software and any personal data. After this process is complete the device will become unbootable until an operating system is installed from USB.

After clearing the eMMC and powering down the device it may boot loop when powered back on with the device continually powering up and rebooting. Do not attempt to power on the device until you have a bootable USB drive available and are ready to boot from USB.

If a prompt is shown to enter a BitLocker Recovery Key either enter the key if it is available or click in the blue area hide the on screen keyboard and then select "Skip this drive" to proceed.

With Working Windows RT 8.1 Installation

1. Open the "PC Settings" app.

2. Select "Update and Recovery".

3. Select "Recovery".

4. Select "Restart now" under "Advanced Start-up".

5. Select "Troubleshoot"

6. Select "Advanced Options".

7. Select "Command Prompt" and wait for the device to reboot.

8. Select your Username and enter your password if one is set, if no password is set press "Continue" when prompted.

Without Working Windows Installation

If your current installation cannot boot to the command prompt it can also be reached from a Bare Metal Recovery image by following the steps below:

1. Boot from USB with a drive containing the extracted contents of a Bare Metal Recovery image.

2. Select a keyboard layout.

3. Select "Troubleshoot".

4. Select "Advanced Options".

5. Select "Command Prompt".

Once the Command Prompt has loaded enter the following commands:

1. At command prompt type the following pressing Enter after each line:

   diskpart
   select disk 0
   clean
   convert gpt
   exit

2. Select "Turn off your PC"

The device is now cleared of all data.