[PineTreeComp]

You can find all the firmwares (ROM's) at the top of the Imagio forum under 'Imagio Development', however I don't think it will solve your MMS problem. At least it didn't for me.
I can send/receive texts fine but not MMS. I also cannot send to an e-mail address. Attempts at either show an error with an unknown phone number that isn't AT&T MMS.
I've tried numerous fixes including registry edits but have yet to solve the problem.

Strangely, even though the message won't go through, AT&T charges me for a message sent.
If you find a fix that works please post it here. My searches reveal many having this problem.
PTC