Can't upgrade new iPod Touch to iOS 15
I just bought a new iPod (the day before they announced their discontinuation :). I then downloaded iTunes onto my PC. When I connect the iPod (using the cable that came with it, and into a direct USB port of my computer), it says an update is ready: iOS15. Yippee!
But every time I try to update, I get an error message: 4000 unknown error.
Has anybody else succeeded in updating iOS?