This guide requires Linux to follow

This procedure was not verified by me

This guide is based on this guide by unofficialtwrp.com

Instructions

1. Enable "OEM Unlocking" in developer settings
2. Power off the device
3. Power on the device holding "Volume -"
4. Select "Reboot to bootloader" in the recovery menu
5. Download the special version of platform-tools
6. Run

   bash start.sh

   (try running as root if it fails)