Stock Wi-Fi cards in the X220 are not compatible with macOS.– Please note the warning on the Advanced menu in the BIOS: Setting items on this screen to incorrect values may cause the system to malfunction! The default values will work fine but the wrong settings can prevent your X220 from booting. ![]() ![]() – To install this modified BIOS from a bootable USB drive, see the instructions here. This modified BIOS will also enable advanced settings and improve battery life under macOS.
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