Q: 1st generation ipod touch won't sync with itunes

Maybe:

An invalid response was received from the device?

How do I resolve: iTunes could not connect to the iPad because an invalid response was received from the device.

Same problem except I have had my iPod from new and have been connected to itunes for what, 12 years or more and now get the same prompt about an invalid response. Is this Apple's way of saying it's too old, buy a new one, even though yours works just fine and "had" 600+ songs on it? Just when I was thinking about a new 32 GB iPad but if this is an Apple tactic to get you to upgrade then I think I'll go with a Samsung Galaxy instead.

Check your USB connections

Errors: 13, 14, 1600, 1601, 1602, 1603, 1604, 1611, 1643-1650, 2000, 2001, 2002, 2005, 2006, 2009, 4005, 4013, 4014. You might also see a message that includes "invalid response."

If the USB connection between your device and computer is interrupted, you might not be able to update or restore.

To narrow down the issue, try different equipment:

• Use the USB cable that came with your device, or a different Apple USB cable.
• Plug your cable into a different USB port directly on your computer. Don't plug it into your keyboard.
• Try a different computer.
• Solve other issues with the USB connection, then with your security software.

If you still see the error message, check for hardware issues.