Can't restore iPad. Getting the following error: The iPad “iPad” could not be restored. An unknown error occurred (2015)

I am trying to restore an iPad 1 on my Macbook Air M1. I have tried multiple USB-C to USB-A adapters, as well as several 30-pin dock connector cables. Depending on which cable I use, I get the following errors: 2015 and 2006. I've seen some comments linking to 2006 errors saying to try another USB cable (which I've tried), but nothing for the 2015 error.

Is this just me dealing with an iPad that has no hope of being restored, or can I try something else?