Okay, let's all point and laugh and call me the forum idiot..... i accidentally flashed the original bios instead of the SLIC inserted version from Serg. I re-flashed and rechecked my ACPI table thingy and found a nice slic2.1 string! Only, it appears to be from HP (?) so i also installed the HP cert for good measure (dont know if it war necessary) and now all works perfectly!
Remove/uninstall LOADER ! I modified the bios with MSI 2.1 Slic ! View attachment 8895 W6796NMS.350 - original bios SLIC.350 - Mod with MSI 2.1 Slic and upload the screen of the Advanced tab of the Slictoolkit for the modified bios, pls.