Maybe the UMD drive is broken, or bad UMD. Does the umd make spinning noises? Umd icon in xmb?
USB umd is only required for dumping games, best leave that setting as memory card.
If it's a 2001 there's no risk on updating to 6.61 which is the latest firmware, but if you are happy with how you are then keep it. Updating might make your console compatible with newer games and some tweaks here and there.
Silicon Power 1TB Micro SD Card U3 Nintendo-Switch, Steam Deck Compatible, SDXC microsdxc High Speed MicroSD Memory Card with Adapter https://a.co/d/2zlSFVO This guys been running fine in my SteamDeck
I have a question about Medicat if anyone can answer.. My windows install is corrupt and wont boot. Does Medicat allow you to run DISM online or do an inlace upgrade? Trying to do some sort of repair install or recovery without a fresh installation