Thanks, i'll look at this closely. I have a server board so I don't have the fancy UEFI menu. I do have an UEFI shell but I don't even know how to browse to a USB key or something to run the storecli commands. I'll figure it out and post here.
Could you please share the detailed step?Perfect. I could not download or backup the existing partitions but I updated to IT mode just fine and flashed the legacy BIOS. Freenas now boots up properly and no timeouts.