IPad (1) unit could not recover. Unknown error occured (21)

iPAD 1 running iOS 5.0
Upgraded the unit. Worked for 4 days.
Started to crash 4-5times in a row and then it just died on me.
Tried restart the iPad without any luck. Boots up and the screen goes white.
Running iPad into recovery mode and connect it to both a WinXP and Win7 machine. Same error message after running restore mode for a while:
iPAD unit could not restore. Unknown error occured (21).
no AV installed on my computers. firewall disabled.
no other USB devices connected.

iPad: Basic troubleshooting
http://support.apple.com/kb/TS3274
Update and restore alert messages on iPhone, iPad, and iPod touch
http://www.buybuyla.com/tech/view/012953a0d412000e.shtml
iOS: Resolving update and restore alert messages
http://support.apple.com/kb/TS1275
iPad: Unable to update or restore
http://support.apple.com/kb/ht4097
iTunes: Specific update-and-restore error messages and advanced troubleshooting
http://support.apple.com/kb/TS3694
If you can’t update or restore your iOS device
http://support.apple.com/kb/ht1808
 Cheers, Tom
Check for hardware issues
Related errors: 1, 3, 10, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 1000, 1002, 1004, 1011, 1012, 1014, 1667, or 1669.
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the error message when you update or restore, contact Apple support.
Message was edited by: Texas Mac Man

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