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This may indicate a hardware issue with your device. Follow Troubleshooting security software issues, and restore your device on a different known-good computer. If the errors persist on another computer, the device may need service.
I've tried all of that to no avail.
My iPhone was in perfect working order before I tried to update to the IOS 6.1, and then bam, this happens.
As far as I am concerned, this is really suspicious since my wattanty JUST ran out, and it seems like a cash grab from Apple to get me to go in to get my phone serviced.
This usually happens if the phone has been Hacked / Jailbroken / Modified...
Unauthorized modification of iOS
If this is the case...You will need to look elsewhere