I am not positive, but I'm assuming you need to install a few things from the installer. I don't know if you can downgrade to 1.0.2 from 1.1.2, can you? Anyway, if you are going from 1.1.1 to 1.1.2 you need to install Oktoprep before the update. I'd say the best way for us to help you is for you to give us the 4th and 5th digit of your serial number (the week build) mine is xxx51xxxxxx, therefore week 51, therefore 1.1.2 OTB.
On a side note, my SIM chip should be here today. It left the Salt Lake City postal service sort facility last night at 9:10pm. I'm sure it was heading up here to my town and will be delivered this morning. I can't wait to get out of class and get it!
Oh, and I think it takes quite a bit of work to get the t-zones to work on it. I haven't looked too much into it, but what I was seeing (which may not be the right approach) had a lot of writing code at the terminal propmt on a Mac. Looked like a pain in the rear. Anyway, good luck.