Unlocking an out of the box 1.1.2
This method is originally developed by George Hotz, as you can see in but here is a tutorial that shows some pictures (STOP AT PAGE 5/9!).
After you have removed the rear covers, you will see a metal shield/cover over the baseband. This one needs to be removed as well. Use a tiny screwdriver or similar to carefully lift it a little all way around (you could lift out the battery to reach the side facing it). There’s two places the shield is glued, so …