Need to dedicate more rams for graphics from bios

[FPH7102]

i know i have an intel HD integrated graphic 520  (i7 gen6 cpu 6500u) and it suppose to work automatically distributing the total RAM's but unfortunately some Devs or Games doesn't figure out that i have enough RAM to do it all (16GB in my case) and still detect integrated graphic as only 128 mb or even Zero in some games , and i know HP has locked advanced features in BIOS and cannot access Vram (or dedicated ram and please i beg you not to elaborate on what Vram actually is cause i know 🙂 ) and allocate as much as i want not cause it works better just to fool some games early detection before running and avoiding errors, eventhough many will argue that it's unuseful and it is automatic but bear with me here even if you are not convinced, i need a way to unlock the advanced featues in BIOS tried the A and F10 updated BIOS to the last provided with myHP app or software that comes with it still nothing. The registery intel/GM/Dword doesn't work either. any help is appreciated. thank you.

my HP Laptop specs :

HP EliteDesk 800 G6 Desktop Mini PC

Device name DESKTOP-4FQG9TS
Processor Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz 2.59 GHz
Installed RAM 16.0 GB (15.8 GB usable)
Device ID 94113112-8ACE-4F50-8580-D70BC6753B78
Product ID 00331-10000-00001-AA565
System type 64-bit operating system, x64-based processor
Pen and touch Touch support with 10 touch points