Replace factory Intel wifi module with a macOS compatible one. Make sure that the card is of M.2 form factor. I replaced it with the BCM94360CS2 card. This works out of the box and has been stable for me thus far.
- The BCM94360CS2 module comes from the 2013 MacBook Air, supports BT 4.0 and 802.11a/g/n/ac. They run on eBay for <$15.
- For the BCM94360CS2 to work with the x1c6, you would also need a M.2 NGFF adapter. They run for <$10 on eBay under "BCM94360CS2 m2 adapter"
However, there exists other alternatives:
- Dell DW1820A, the "CN-08PKF4" model is reported to have the most successes, so make sure to look for that specifically.
* macOS cannot be installed on the factory installed PM981 drive. Replace macOS-incompatible factory Samsung PM981 with preferably another M.2 drive.
* NVMeFix](https://github.com/acidanthera/NVMeFix) is still in its early stage. However, it has dramtically improved NVMe power management. In my personal experience, it is no longer far from SATA power consumption. I now recommend that you go with an NVMe SSD for the faster speed.
* An additional hard drive can be installed in the WAN slot. It can be used for a cleaner dual boot experience, or simply as a backup or storage drive.
