Need help to revert from Cym 2.2 to stock rom

[nmoreman]

I am a newbie with a problem and need help.

I rooted my phone to Cym, love it, and am going to get the Evo today. So I
am giving my rooted phone to my husband.

Unfortunately, Sprint cannot change phone numbers on the phone and activate
it, I cannot tell them the problem, and cannot take it in for service as they
suggested.

Can someone help me on how to get it back to stock, 2.1--5 preferably so I
can reflash back???

Thanks