I have an iPhone with FW 1.0.2
I tried to activate it using ibrickr, but in some stage during the activation (when I should press the "sweet" button in iBrickr dialog) my iPhone restarted and freezed on the apple logo screen on startup.
I waited for long time but it freezed on that screen.
I also tried to restore the FW (version 1.0.2) using iTunes but this didn't help.
The restore process works but the iPhone freezes on boot time (when the gray small apple logo appear).
I don't know what else can I try to do besides restoring my iPhone using iTunes.