Windows Upgrade Help and more

Yeah, Agreed, that revert option is your safest bet. Also, if you can get into the BIOS, double-check that your drive is still set as the first boot device. Hope that helps.

Can confirm. I had the same problem. Even after that, I needed to make sure the specific app, like Netflix or a game, was set to output Atmos in its own audio settings.

You'll probably need to enable TPM and Secure Boot in your BIOS first, but if they're greyed out, your motherboard might not support them. Check your PC or motherboard manufacturer's support site to see if there's a BIOS update that unlocks those features.