Hey guys,

I just bought an iPhone 3GS off eBay.. claiming to be on FW 3.1.3
It came with that emergency screen so I just needed to jailbreak it to get in.
Little did I learn that this was actually a FW 4.0

I have searched numerous ways how to fix this.
Is there a way to get this to work on Tmobile? (Jailbreak + unlock)