Fujitsu Lifebook s792 bios unlocking

[Murderpanty]

Hello everyone
I recently bought this laptop from a friend for really cheap and since it came with some nice specs (i7 3520m, 8gb ram, 250 ssd and 500gb hdd) but a weak gpu (intel hd) i decided to try an egpu setup, everything went perfectly smooth until i realized that i cannot use nvidia optimus because i cant force the pc to boot from igpu first since theres no option for that in the bios.
I've already searched high and low for a modded bios for this model but havent found anything so far and too much of a noob to try and do it myself and risk bricking my pc.
I'd really apreciate if someone could help me and thanks in advance.

Bios extracted with Universal BIOS Backup ToolKit 2.0, think thats how you do it right?
https://www.mediafire.com/file/93st739bp...1+bios.rom

And if that one doesnt work, heres the link from the manufacturer's site:
http://support.ts.fujitsu.com/IndexDownl...6E83246BD3