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not from the beta no, but the GM should be the same as the official release.

u wont be able to click check for updates in itunes as it will say u have the latest... if u dont wish to use the GM build then u can restore to iOS 5.what ever its upto :p and then OTA update.

Thanks :) One last question. If I download and install GM now will I be able to OTA Update later in a few months when Apple releases updates for iOS 6 ?
 
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