tmobile iphone problem please help!

[mrguyname]

Hey guys I just got an iphone with 3g yesterday, and since I'm tmobile i got the gevey3G turbo sim. At first, everything went well, and then when I synced my iphone with itunes, it kept asking me to update itunes to 8.0 and i updated my iphone from 2.0.1 to 2.1.

I realized that I shouldn't have updated the firmware so I decided to restore the iphone and now my iphone is stuck at the "sync to itunes" mode and itunes won't read my iphone as when i sync it it says "your sim card is not blah blah" basically stating that since my sim card is not at&t, it won't sync it. Are there any solutions to this besides jailbreaking? Please help

Also, would it work if I took my friends at&t sim card, put it in my iphone, synced it to itunes to get rid of the "sync to itunes" thing, and then switched back my tmobile+gevey3d sim?

please help me asap! thanks guys!

[speedious]

did you find an answer to this problem? I am facing similar problem. Please reply