Not familiar with bcdedit but I could try.

Yeah, I wouldn’t say I am, either—strictly a dabbler. For me, it’s just a matter of finding various forum posts from other people trying to get it working, and applying different suggested fixes until something works (ideally). There are tons of helpful comments out there, if you can find them.

I wouldn’t mess with bcdedit unless you get linux installed, but there’s no boot entry for it in your bios.

I recently got my old Dell dual-booting windows 10 and mint. Didn’t have issues getting mint installed (I used Etcher to burn the ISO to a USB drive), but windows absolutely didn’t want to play nice with Grub, and I had to use bcdedit to get it to load the boot menu. Working fine now, though! Looking at some articles, it seems like f10 is probably your bios key. It really ought to be able to boot from usb; my mobo is 12 years old and supports it.