Yeah but now you're using Atmos files designed for 9.1.0 fw on a 8.1.0 fw so that's probably the issue, use an older Atmos and see how that works.
Stop keep talking about downgrades, you're going to brick your Switch. I told you not to last time and you went ahead and did it and now it's even more broken.
Downgrading your Nand is NOT going to help you.
I tried newest Atmosphere Files and I tried My MicroSD Card Backup that i simultaneously did with my 8.1.0 NAND Backup.
Both Newest Files and the Backup MicroSD Card Files don’t work.