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Hi,

I am attempting to upgrade a (jailbroken and unlocked) iPhone 3GS iOS 4.0.1 with the 05.13.04 baseband and new bootrom to 4.3.3, while preserving the bootrom.

I am using sn0wbreeze 2.7 on Windows. I have managed to create a custom firmware file, I am running the TSS server with tiny umbrella and I am attempting to recover the firmware to the phone (I am not sure I am supposed to do this, but I get error 3194 otherwise).

Indeed the process seems to go through, but then iTunes reports Error 37. If I try it again, it will come back with error 1600 without actually trying to put anything on the phone.

Is there anything I can do? If not, how do I go back to the jailbroken/unlocked 4.0.1 state I had before (I need the unlock).

Thanks!