you sure that usb has 32gigs? might be scam one that says it has more space than it does (would also explain the boot problem maybe?) but you said it launched fine once so i’m not sure/a mint iso won’t fit on 4mbs? but reformatting should definitely “reset” the usb… . have you tried it with a different one?

With grapheneOS you can

I use piped/newpipe etc. and simply support creators i watch via patreon/direct donations/merch. Less money for shitty ad company more money for creatives.