How to Fix 16xx and 21 Error during iPhone 3.1.2 Restore in iTunes

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  • Replace your iTunes to newest model.
  • Are attempting once more..
  • Additionally are attempting killing iTunes course of in Process supervisor and iPod services and products after the error happens. Reopen iTunes and take a look at once more..
  • Are trying altering the USB port the or on every other device.
  • learn out http://support.apple.com/kb/TS1275

or

iPhone 3G, 2G and iPod Touch, iPod Touch 2G users can use iREB to get rid of this error:

  1. Download iREB
  2. Start iTunes and put your phone into DFU mode:
  3. Now close iTunes and Start iREB on your PC/Mac.
  4. Run the iREB. Select your device and wait for a few seconds till you get white or a red screen on your iPhone.
  5. Open iTunes. Now press and hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore”  button in the iTunes. Select a custom .ipsw file and restore it. Your 16xx errors are gone.

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