Bios Mods -The Best BIOS Update and Modification Source

Hello,

i need to reduce my TOLUD Value (from 3,5GB --> 3GB) for eGPU and maybe i can do it, if BIOS advanced menu is unlock!?
Note: i know, how/that i can do a dsdt override ...

Motherboard Manufacturer and Model: Medion E6227 (MD 98098) 1.0
BIOS Type: AMI BIOS / ACPI 2.0
BIOS Version: 208 
Here are "results.rar" with BACKUP_Tools12: http://rgho.st/8hgWHvXf2
Here is backup ".rom" of bios using Universal BIOS Backup ToolKit 2.0: http://rgho.st/8mYVMg9sx

My Hardware:
-Win 10 Home
-CPU = i5
-RAM = 6GB

So much Thanks!!

I used AMINCP.exe to open my AmericanMegatrendsInc.-208.rom and find under :\chipset\System Agent (SA) Configuration\Memory Configuration "Max TOLUD = Dynamic" (see Pic). If my BIOS is unlocked, should i can see that entry into my unlocked-bios?
[attachment=13240]

I made some changes (see Guide https://www.bios-mods.com/forum/Thread-G...EFI-Aptio4) but on flashing bios it show me "BIOS is write-protected" (see Pic). 
[attachment=13247]

on https://community.medion.com/t5/Notebook...td-p/44334 (German) i asked for a new bios = not supported