@ orbital
When you Downgraded back to 1.1.1 from 1.1.2, all you need is to jailbreak the phone then install oktoprep from installer then upgrade back to 1.1.2. Once upgrade is completed you will see a USB Cord and a disk and the slide to emergency is talking in tongues.
Now ofcourse assuming you have the jailbreak.jar downloaded, on your 1.1.2 jailbreak folder run windows.bat for windows, not sure on mac sorry.
check the install ssh then let it run till it finished it will tell you to reboot your iphone. it will reboot itself again after you reboot it then you will have the slide to unlock instead of the slide to emergency talking in tongues. If you need it unlock, install anysim 1.2.1u from installer. Turn airplain mode on. set auto lock to never then run anysim.
You can choose the guide of your choice under unlock
IF you still want 1.1.1, then you will need to downgrade your baseband too.