a) your device ID and version number,
I bought the Touch in California. I have only ever used it in New Zealand though.
I did the update to 2.0.0 over Wifi. That installed fine, but had slow page turns, wrong covers, and poor sideloaded font support.
I installed the 2.1.1 (r42411, 8/24/12) using USB. That install went fine too. Page turn speed fast again. Still has wrong covers bug, and poor sideloaded font support.