How to Recover Stock Image (aka. Official System Recovery)
- Install bootloader
- Download stock image from official website
- Turn on USB-debugging mode
- Turn off your cellphone and press Power + Volume Down, to enter bootloader.
- Connect computer with USB, and input the following command on computer (open up the DOS screen):
fastboot flash recovery recovery.img
- If successful, enter official recovery mode with pressing power+button down
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