HT4972 i have iphone 3gs v 4,2.1 i want to upgrade to ios 5 i will erase all data, how can i install again the software, and now my device can not detect to my computer? what can i do? please help me..

have iphone 3gs v 4,2.1 i want to upgrade to ios 5 i will erase all data, how can i install again the software, and now my device can not  be detect to my computer? what can i do? please help me..

You can not install iOS 5. It is no longer signed by Apple. You can only install the current version of iOS. For a 3GS, that's 6.1.3.
However... if you have 4.2.1 on your phone, odds are it is not a 3GS, it is a 3G. If that's the case, you've reached the end of the road for that. It can not run anything higher than 4.2.1.

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