I recently bought a secondhand 3GS, and updated it to iOs 4.1 without thinking... Turns out that the phone was already jailbroken, and iTunes tells me the phone has a problem. Limera1n works great, and the phone works. However, the IMEI is set to 00 499901 064000 0, which I've heard is pretty bad news.
I would like to know if a 05.14.02 baseband unlock by ultrasn0w would fix this?