Socket 1366 - GA-EX58-UD5 Update BIOS

[Sim77]

Hello guys ! 

I recently learn that it is possible to update BIOS with custom / modded.

I have one old gigabyte mobo socket 1366 (i7 - 1st generation) , GA-EX58-UD5 - socket 1366

I bought one M2 NVME expansion card and i connected to mobo PCIe x2.0 (i think) slot.

The M2 NVME 2 tb (PCIE x3.0) card was recognize by the system but i think it is not possible to work as a boot drive (windows)

Can someone assist me on this ? can i update the BIOS and what are the benefits i will have if i do this ?

I think that my BIOS is legacy not UEFI so maybe it is not possible to have M2 NVME as a boot drive but if i choose to update the

BIOS what are the advantages ?