Bios Mods -The Best BIOS Update and Modification Source

Hello. I need to disable integrated GPU, so I try to change var: I used phoenixtool and custom parser to unpack bios file, and to find necessary variable ID and available values. I did it. Unfortunately, when i booted from efi grub, and tried to change var, i got error:
Photo

So, may be smb know how to fix it? (I tried do it in UEFI and Legacy mode)

Notebook: HP Pavilion 15-n208sr (ENERGY STAR)
BIOS: Insyde20 F.16 ( sp69882.exe )

Link to BIOS update (HP site)

I have Windows 7 x64, but to see BIOS update on site, choose Windows 8 x64.

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P.S. Are there bios for my notebook with unlocked advanced menu? Or maybe smb know how do it?

Is there hope?

1 year had gone, maybe now somebody could say some ideas about it?)

Hello!
I'm strongly recommend you do not touch video settings including disabling one of GPUs. It will brick you laptop and it can be recovered in repoair service only!!
Besides, your bios produced after Jan 2012 and have internal RSA checking so is not moddable!