Modify bios frame buffer size to 2 Gb on Lenovo ThinkCentre M715q 2nd Gen

Hello. Is it possible to modify the bios on the Lenovo ThinkCentre M715q 2nd Gen nettop to 2Gb?
The maximum amount of allocated video memory is 512 MB, if you set it automatically, it is allocated 1 gb.
I tried changing the parameters in AMIBCP-5-02 in the UMA Frame Buffer Size section from auto to 2G, but there was no result.
Then one person on one of the forums suggested that from Boot_Shell_AmiSetupWriter line enter the command UEFI amisetupwriter 0x50 0x40 or amisetupwriter 0x50 0x00, then amisetupwriter 0x176 0x40. but the same result was no. Most likely, this limit is written in the code, and it must be sought by digging through half of the firmware
Below I attach the BIOS dump, merged by programmer