Steps to change the DVMT value (Done on Windows or WinPE)
/!\ Warning, some files in attachment will show as infected, you'll need to disable your antivirus temporarily
Use at your own risk!
1) Universal BIOS Backup ToolKit 2.0.exe - to backup the BIOS (i.e. DellInc.-A07.rom)
2) UEFITool.exe to find the module labeled SetupPrep (not Setup as per FireWolf’s guide) and extract the PE32 image section (setup.bin)
For Dell Only: Search with this