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I cannot update existing apps or download new ones. When I try to update, it just says "waiting". Any ideas?
See Here...
https://discussions.apple.com/thread/4074945?tstart=0
Try this first...
Close All Open Apps... Sign Out of your Account... Perform a Reset and try again.
Reset... No Data or Settings will be lost...
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.

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