Thanks Illia and Nester! You were spot on here, I didn't unplug the device from the vehicle as I put the updated HDD back in. So that's apparently a key step as well. I didn't remove the device as the radio etc. work just fine without the hard disk.
Anyway, I'm all good now and everything is fine and dandy. Cheers from your neighbor!
Super! Hienoa!
I'm really glad that everything turned out!