the problem is that your baseband increased with the 5.0 update and the that baseband is not compatable with any old os. so i am afraid you are stuck at 5.0 and wont be able to go back.its just another trap by apple to keep us from hacking/flashing there phones.
so unless there is a tool developed to downgrade the bb of the phone(which is prolly never gonna happen) then your stuck at 5.0 and beyond.
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