How to Detect UEFI vs. Legacy BIOS Mode Using WinPE

Querying the System Registry: In your WinPE environment and open a command prompt. Enter the following command:

reg query HKLM\System\CurrentControlSet\Control /v PEFirmwareType

The output will provide a value that indicates the mode:

• 0x2 denotes UEFI mode.
• 0x1 signifies Legacy BIOS mode.

In the Absence of PEFirmwareType Value: If you don’t see the PEFirmwareType value, you might need to initialize the WinPE environment. Use the command:

winpeinit

Automating the Detection with a Script: For those who prefer automation, here’s a script that can detect the BIOS mode and execute mode-specific commands:

@echo off
wpeutil UpdateBootInfo
for /f "tokens=2* delims=   " %%A in ('reg query HKLM\System\CurrentControlSet\Control /v PEFirmwareType') DO SET FIRMWARE=%%B
if %FIRMWARE%==0x1 goto BIOS
if %FIRMWARE%==0x2 goto UEFI
goto END

:UEFI
:: ajouter votre script ICI
goto END

:BIOS
:: ajouter votre script ICI
goto END

:END