Looking it up again I couldn’t find a self host website for it but here is a good writeup on it. Firmware is archived elsewhere and people have looked into the JavaScript that does the flashing process, so I imagine it wouldn’t be too hard to make a permanent tool, but also it isn’t needed until end of the year.
Only issue I have with KISS is I can’t for some reason clear whatever it is that is setting an icon for my PWA for voyager. It shows the updated icon in recents, pixel launcher doesn’t have it updated though either which makes it harder to tell if it’s the launcher or fennec (Firefox) at fault.
Edit looks like it was kiss. Regenerating icons doesn’t work. Clearing data does. I exported settings, cleared data, added pwa, icon changed, imported settings. Only downside is I lost my history.
I would do a charge back with my bank / credit card. He didn’t get the goods or service he bought and it was because of the company so I’d say there is a chance. It also would hurt MSG a tiny bit.