Installing Windows 7 on the pure UEFI systems without CSM

casio4ever · May 20, 2025 at 19:08

PrimeExpert Software said: ↑

Hello everybody,

Starting from FlashBoot 3.3s, we have updated VGA emulation patch for 64-bit UEFI loader of Windows 7 to configure VGA arbitration for PCI bridges and GPU devices at boot time. This should fix Code 12 error for GPU devices in the Windows Device Manager ("This device cannot find enough free resources that it can use") -- on motherboards whose firmware doesn't do that properly in UEFI mode. Well, it's better late than never. Many thanks to Canonkong for providing useful sample code. Everybody is welcome to test the new version.
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So Does it Work For Nvidia RTX 20xx GPUs Without Any Problems ?

Installing Windows 7 on the pure UEFI systems without CSM

casio4ever MDL Member