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How do I Restore & Erase an iPod Nano 6th generation Without a Computer? It says I need itunes help to restore but itunes doesn’t recognize it.

Check/try a different USB cable and USB port or perhaps. Also charge the iPod with a wall charger first. Try a RESET of the iPod Look HERE and follow the troubleshooting guide to resolve the “not recognised” issue. Then you should be able to do a restore via iTunes.