Error 5021...what is it?

I was listening to iheartradio and then all of a sudden it wouldn't play aymore and I got an error box that said "error 5021"
??????HELP!????

Try the following:
1- Change the USB port the phone is plugged into. Do not plug the phone back in yet.
2- Reboot the computer then plug the phone in and immediately restart the phone in DFU WHILE CONNECTED to the computer.
3- Hit restore.

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Wait.. Everything on iTunes worked, but when I insert my sim it brings me to the start were I have to choose my language, etc... Then it says activation error.. Are you sure it's the sim card?
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Error 5021...what is it?

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