iPhone G1 updated and now doesn't work

[MetalMarine]

Hey guys I was wondering if I can get some help on this. Here's the problem, It’s a locked iphone (G1, 8g). Locked for T-mobile use. It was and working fine until it RELOCKED after I got itunes version 7.7. I tried DOWNGRADING 7.7 on my itunes but it still didn't work. I have no idea what to do now, Can anyone please help?

 

[benflick]

Your iPhone can't be "Locked" for T-Mobile.

 

[MetalMarine]

I meant it was unlocked for tmobile use