Install the patched BIOS version 1.42 to remove the whitelist check and permit the installation of an OS X compatible wifi card. This patched BIOS will also enable advanced settings and improve battery life under OS X.MD5: 6197564cb5edd4dc6136f39d8484924d– Stock wifi cards in the X220 are not compatible with OS X– Recommended half-height Mini PCIe wifi cards that require no configuration whatsoever and will work automatically in OS X: Dell DW1515 and Dell DW1510 (optional steps to rebrand a DW1510 as Apple AirPort Extreme available here)– For 802.11ac + Bluetooth as well as Continuity/Handoff/AirDrop support, the AzureWave AW-CE123H card will work by following the steps in the guide here. Note that it will not be possible to boot from the standard USB installer with this card installed; only install this card after the OS X installation is complete and the necessary modifications have been made.– Various other Mini PCIe and USB wifi adapters compatible with OS X are listed here
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