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So according to @Hervé's guidance, I was able to use my DW1820A. My configs were posted here. After some research, I'm able to use Auto Unlock function now, and still no freeze, after 1 hour of usage. A. Some research. Model Typical Devices Device ID Auto Unlock Supports BCM94331CSAX MBP 2012 14e4:4331 NO BCM943224PCIEBT2 MBA 2011 14e4:4353 NO BCM94360CS MBP 2013 14e4:43a0 YES BCM94360CS2 MBA 2013 14e4:43a0 YES It looks like by faking dw1820a(bcm4350) into 14e4:4353 will make it looks like an 2011 mba card, and won't get Auto Unlock function. BCM433x can't use auto unlock, BCM436x can. DW1820A was BCM4350, in between of 433X and 436X. B. The new config. So instead of faking the card into 14e4:4353, and setting brcmfx-driver=1, I tried 14e4,43a0 and set brcmfx-driver=2. And that's it, nothing else changed, everything's working, including Apple Watch Auto Unlock. (It didn't work in the first place, but worked after disabling and enabling the feature again). C. Some screenshots and terminal outputs. a. kextstat|grep -y brcm b. SysInf Wi-Fi. (firmware version changed, and the Auto Unlock line comes out) c. SysInf BLE.( firmware version changed) D. Some problems. I heard some noise, maybe coil whine, after booting into the system with this new config. The noise disappeared after several minutes. I never noticed such noise before switch to this config.