This won't work. You can't bifurcate the 8i slot to x4x4 either. You'd need a
PLX switch. Or a different motherboard…
Put setup_var.efi on FAT32 formatted USB thumbdrive.
Plug in this drive. Power on the MJ11, press F10 for Boot Menu and select UEFI Shell.
Press Esc when prompted to halt boot and enter the shell.
Type
map
for a list of filesystems. There should be at least a
fs0:
, and possibly fs1:, fs2:,…
Try them in turn until you've found your thumbdrive: Type
fs0:
, and then
dir
to list files. If you don't see setup_var, try with the next drive.
When you have found setup_var, type the command(s) in my above post.
setup_var 0x1FF -i 0x1
to check the value. If you're still set to NVMe because you have not reverted to SATA before reflashing F09, it should return 0x1.
Type
setup_var 0x1FF 0x3 -i 0x1
to get your SATA ports back. Then
exit
, or plainly reboot.