Bios Mods -The Best BIOS Update and Modification Source

Hi. Im new in modding bios...and although I have red almost all the posts, I can´t find a solution to my problem. I have a VGN FZ18E, from Sony. The motherboard died and I bought a new one from Ebay. The only problem is that inside the bios, once you press f2, it shows Model "9x" instead the original FZ18E and the serial number is 12345678-1234 not the one that is on the sticker in the laptop. My question is, how do I change this parameters in order to proceed, afterwards, to mod it?
And... where can I find a original bios from Phoenix R1120J7?
Thank you very much in advance!

Of course the new motherboard will have another serial number logically, and maybe other model specs.
You can chage these in Hex Editor to the values you like.
Here is the original full backup bios R1120J7 that comes with that laptop.