HELP! iPhone 3G, stuck on sim insert screen
I need help please, I have an iPhone 3G, was happy on 3.0 till I upgraded to 3.1.3 using sn0wbreeze, then ran blackra1n, the phone then wouldnt boot and was stuck on the snowflake.
In desperation I had to install the official 3.1.3 using itunes, which now gives me an iphone which says insert a SIM from AT&T (I live in the UAE and dont have this), it doesnt go to any other screen apart from the SIM insert screen and the emergency screen.
I tried downgrading to 3.1.2, but it wont allow me, tried to go to custom 3.1.3 using sn0wbreeze, but even that either gives me a 1600, 01 or 04 error, have tried in DFU and recovery mode.
Thanks in advance,