- Power off phone
- Use hardware keyboard
- Press and hold the 'X' key and Power button until you see a screen with an exclamation point inside a triangle
- Press and hold the Volume Up key then press the Camera button (I had to do this twice) to get menu screen (Linux back-end becomes VERY apparent here)
- Using the D-pad, select one of the Wipe options (specifically Wipe Data/Factory Reset)
- Confirm your selection and wait for it to complete
- Reboot the device