Help! My phone was activated and unlocked. I had to run it on blackra1n everytime I connected my phone to the computer. But it was fine. I was able to use an unregistered sim without a data plan. And then I accidentally upgraded. Ive tried restoring it with various custom IPSW files from different programs (Ive even tried 3.1.0, 3.1.1, 3.1.2, and IOS 4) but my phone refuses to restore or restore unlocked. It still keeps asking for a valid sim. Sometimes, iTunes tells me that the device isnt eligible for the requested build. I cant use redsn0w because no matter what IPSW I try to use with it, it cannot be recognized. Sn0wbreeze did not work either. Ive tried on both a MAC and a PC. According to forecast, my phone can be jailbroken but not unlocked. Bootloader is 6.4. Any help would be greatly appreciated, thanks!