Lenovo Thinkpad T420 – Removing Whitelist from BIOS 1.49

I wanted to install an Intel 7260-N WiFi PCIe card into my T420. For this to work, I had to flash a modified BIOS that removes the hardware whitelist. Unfortunately, I had just upgraded to BIOS 1.49, which ostensibly cannot be downgraded.

The solution was to manually call winflash using the sv and sd flags:

winflash.exe /sv /sd 83ET76WW\$01C8000.FL1

The above command assumes that you’re in the bios_mod folder, which is contained in the modified BIOS archive on ThinkWiki.

About Jeff Fitzsimons

Jeff Fitzsimons is a software engineer in the California Bay Area. Technical specialties include C++, Win32, and multithreading. Personal interests include rock climbing, cycling, motorcycles, and photography.
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