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As mentioned, try recovery mode. If you're still getting issues for whatever reason, a DFU mode restore should fix it.
If you want to direct download the firmware file instead of using Apple's rubbish built in manager, here are some instructions I've put together
Tutorial: http://iphoneza.co.za/install-firmware-file-itunes-instructions/
Download links for iOS 8.2:
http://iphoneza.co.za/ios-8-2-released-bug-fixes-stability-improvements-download/
Give me a shout if you get stuck![]()