Hey guys I recently got a new iphone 3gs and it's currently on 4.0.1 and I need to downgrade it to 3.1.3 so I can jailbreak it and use Pwnage tool 4.0 to jailbreak it on 4.0.1 and unlock it for tmobile. But I can't seem to downgrade it. Everytime I try to restore it back to 3.1.3 in DFU mode it always communicates with Apple and says it's not compatible with this iphone or it says the Apple servers are down. I tried changing my hosts file and adding 126.96.36.199 gs.apple.com but it still doesn't work. Any suggestions?