From Newsgroup: misc.phone.mobile.iphone

At night, the device automatically tries to download the update, but the installation can go wrong, and by morning, the user ends up with a completely locked device the service chats are flooded with messages about the problem

It was reported that the only way to revive it is by flashing the firmware with the loss of all data and you must restore from the backup.
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Via JLA Forums web gateway for misc.phone.mobile.iphone: http://www.jlaforums.com/viewforum.php?f=367
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