1st generation iphone was upgraded to 2.0 while on t-mobile network

[beco8275]

Okay, so I have searched high and low for a way to fix my i phone. I am with t-mobile. I have followed supposedly all the steps to fix my stupid phone to no success. I keep getting errors, when I downgraded from version 2.0 to 1.1.4. Also, I switched to version 7.5 of itunes. I still keep getting errors saying that "the iphone could not be restored. An unknown error occurred(20). Nothing will load, I also have tried to put it in dfu mode.. and nothing. What in the hell am I doing wrong? Someone please help!!!
I appreciated

 

[deetsnai]

You can have an unlocked 1G iphone with the 2.0 software. Just get the new pwnage tool (version 2.0.1) and the official 2.0 firmware. This will build a firmware that you can update with iTunes 7.7