i was using an unlocked tmobile g1 (with a vodafona line) for a couple of weeks. after getting the latest firmware update, it shows no service available and i can't use my line anymore.
i tried my line with other phones, so there's no problem with it. and also, i tried many other lines except tmobile..
is it possible that it's because of the firmware? if so, how can i revert it?

is it possible that it's because of the firmware? if so, how can i revert it?