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how to update i0s 4.1 .BB 2.10.04 to ios 5.1. or what ios i suppose to update

luckytomyu

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Jun 28, 2012
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HI, I need help , i just buy used iphone 4. with IOS 4.1(8B117) base band 2.10.04, what IOS i suppose to update and what base band have to update too?
I need to unlock too after that because now it AT&T , I'm going to used T Mobil sim
Thanks
Lucytomyu
 
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