iPhone enters DFU mode when SIM card instered and back to normal when taken out

[supra_10s]

Someone please help!! I have tried to restore and unlock my iPhone 2G again but nothing is happening!! when i restore the phone instead seeing the apple logo with the loading bar underneath it the screen goes white and lines show up everywhere, it doesn't look normal. I restored the phone and then jailbroke it with Blackrain and everything is normal until i insert my t-mobile SIM card, as soon as i insert it it goes into DFU mode and when i take it out it goes straight to the home screen and everything works just fine. it only goes into DFU mode when the T-mobile SIM is inserted.

iPhone 2G
3.1.2

someone please help

[kraziebone]

Does this happen even if you insert a AT&T sim?

[supra_10s]

No it doesn't. It works just fine if I insert the AT&T sim into it.

[adp]

Try going to a T-mobile store and replacing your SIM card (for free)

[supra_10s]

I've already tried two other tmobile sim's and they all do the same.

[aznking1551]

Have you tried using redsn0w?

[DJM AutoWerkz]

Download a custom 3.1.2 unlocked ad activated ipsw then restore your iPhone to that one see if that worked.

[MyDoggieJessie]

Can anyone help on this? I have the same problem.