https://github.com/StarDustCFW/ChoiDujour
this is a modified version which is what I used, this allowed me to create 8.0.1 and 8.1.0 successfully. RetroGamer74 released a vid which someone on here linked me too. I’ve used his PS4 payloads before and we’re decent. His vid on it looks successful. Mine unfortunately as mentioned black screen after Nintendo logo. I believe again, this is system partition related and hopefully should be an easy fix. Try creating your 6.x firmware Witt this. Make sure the firmware is signed. It will tell you. And ensure you have your bis keys in HacDiskMount partitions. Restore the newly created partitions from the modified chor version above to your switch. - BUT before doing that. If you have the Nintendo logo already. And you’re already on 6.x. Then create firmware as mentioned above and just replace system partition with the files / folders from there. Then try again
Awesome a glimmer of hope appears.... this might be a little far fetched but could it also maybe have to do with exfat/fat32...
Let me explain perhaps our issue stems from the fact that the flashed nand back up used fat32 (least I know this was my case) while the files generated by choi use exfat (though this can be changed by adding --noexfat to the command line).
So when the system boots it looks for exfat in the nand while the nand is fat32?.... I don't know...