[1.1.3] Restore to 1.1.1 or 1.1.2 -> Incorrect SIM
I have a legit O2 UK iPhone with contract. I bought it with 1.1.2 on it, had no problem using iBrickr and the 1.0.2, 1.1.1, AppSnap, Installer, OktoPrep, 1.1.2 thing. Once I read that 1.1.3 has been jailbroken and there was some positive feedback, I upgraded to 1.1.3 using iTunes.
If I downgrade to ANY other firmware than 1.1.3 now, I get the incorrect SIM message. In 1.1.1, I tried to do the *#307# thing and could get to the jailbreakme page, but when I try to install AppSnap, nothing happens. Yes, I have waited half an hour, all I get after 5-10 secs is the activation screen with incorrect SIM. I tried it several times, I went back to 1.0.2, then 1.1.1, no change. I can't jailbreak 1.1.1 anymore... any ideas? I tried it with the phone on the dock, off the dock... I didn't sacrifice a chicken yet, but I may feel like it soon.
Of course the SIM in the phone is the legit O2 sim...