Bios Mods -The Best BIOS Update and Modification Source

Full Version: [REQUEST] HP Pavilion 15 Notebook PC
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Hi,
I need unlock the bios for assing 2Gb to Radeon R5 Graphics that is limited to 1Gb and the option to assing is hidden in the bios setup.
The bios data is the next:

BIOS Type: AMI
BIOS ID: F.45
BIOS Date: 2017.03.17
BIOS Vendor: Hewlett-Packard
BIOS Version: F.45
BIOS Size: 8388608
Chipset: AMD 1566 rev 0
Motherboard Name: Hewlett-Packard
Motherboard Model: HP Pavilion 15 Notebook PC
System Name: Hewlett-Packard
System Model: Chassis Version
Base Manufacturer: Hewlett-Packard
Base Product: 2268

If I have to downgrade the bios, what bios i need to apply?

the bios file link is: http://ftp.hp.com/pub/softpaq/sp79501-80000/sp79605.exe

If no exists the bios mod, how can I mod this bios myself? I have knowns of programmer and HEX.

Sorry for my bad english, i'm spanish

Thank you very much!