Old MyTouch How To's -
How To Unroot/Downgrade to Cupcake on the MyTouch
How To: UnRoot Your T-Mobile G1/Get Back to Donut | TheUnlockr
Tried this, and after flashing the update I can't even boot into recovery mode. All I get is a black screen. Please help! I was wary when I saw G1 in the title, but thought it must be OK to do since it's in the MyTouch sticky
Please, is there anything I can do to recover this phone?