Hello everyone, I am new to this forum and not tech savvy at all.

My friend helped me jailbroke and unlock my Apple 2G with redsn0w. For a while I was able to do mms using an app on Cydia but one day it just vanished. I have not been able to do mms sending photos in messages since.

I was told that the 3.1.2 firmware has native mms on 2G iphone. I would appreciate if anyone could guide me, or direct me to instructions, on how to upgrade to 3.1.2 without losing my unlock and keep all my iphone information intact. I've read a lot about losing baseband and unable to downgrade etc.

I now have firmware 3.0.1 (7A400) on baseband 04.05.04_G on my iphone 2G I have a Windows XP computer and do not have access to a mac computer. I am on the Tmobile network.

Thank you in advance for your help.