@BrahimS - great at least one BIOS got you back up and running!
Big shame on that initial tech you spoke with now, I used stock BIOS to rebuild those for you, and #3 only had one windows key/padding file copied over from your dumped BIOS into rebuilt volume module. I wasn't sure if that alone would keep your activation, if not I planned to try further copied modules from your dump.
He probably wanted to do what I did with #1-2 and use some similar dump's NVRAM instead of yours, which I would do too but then you still loose your system details and that's just a really dirty/non-ideal way to do a BIOS rebuild due to all the details contained in a NVRAM volume.

I'm always concerned when putting back NVRAM from bricked system into a new BIOS for recovery, since the problem can often be in NVRAM, but sometimes you get lucky and it all works perfectly (meaning problem not in NVRAM)
the only bad thing about not using that, is often loss of some board details (Serial, UUID etc), and on this board I think those could be kept there and the other padding I mentioned I left too. So without board details you probably can't RMA, unless you still have box and receipt, but at least windows activation still works.
Also good your wireless is still working too, and MAC does not look generic so that's a plus!

You can look for your other system info for me to transfer back into another BIOS, but I believe I have it all from your stickers, just not way to know how to put it back into the files properly without a known working dump from some other same system and it's exact system details given as well.