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electro001

i have 4.2.1 software how can up...........

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VarDOS

Unfortunately you cannot update any firmware beyond 4.2.1. That's because Apple has stopped signing new firmwares for old gen devices.

Still if you want to give it a try, use Whited00r it allows you to install iOS 5 on your old devices. Just Google 'Whited00r'.
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