I'm kinda at my wits' end here, so I hope someone can help and this is the right place to ask.
I started out on a Switch with 7.0.1 and 9 burnt fuses. For some stupid reason (I wanted to install the hbmenu nsp), I wanted to downgrade to 6.2.0, so I did so using choiNX. Everything seemed to go well, but after the downgrade my Switch wouldn't boot neither CFW (error code 2000-0000) nor OFW (some other error I don't remember now). Next thing I did was follow the manual downgrade guide on sdsetup.com to get to 6.1.0 (and eventually back to 7.0.1 again.) Again, everything seemed to go well, until it came to actually boot the system (step 13.11 of the guide), when I just got a black screen. I saw someone on reddit mention that deleting the contents of the SYSTEM partition with hacdiskmount solved a similar issue for them, so i redid the whole process, and deleted all the SYSTEM files. When booting AMS I now got the atmosphere splash screen and the Nintendo logo and then another black screen. Then someone on here suggested I copy over the generated SYSTEM files from choidujour to the partition. When I did that and tried to boot, I got the Nintendo logo and a black screen. Can this be fixed?
And no, I don't have any backup whatsoever...