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I'm having trouble forcing my mac to stay connected to my external USB Bluetooth adapter on reboot/restart.

I've read quite a few posts and have found this command

sudo nvram bluetoothHostControllerSwitchBehavior=always

I was able to use Bluetooth Explorer and I switched it to the new bluetooth USB dongle but it will still not remain connected after reboot. Instead it remains disconnected and I have to reconnect it every time I restart my computer.

Machine: 2018 Mac Mini

Current OSx: Catalina 10.15.5

External Bluetooth Adapter: Asus BT400

https://www.amazon.com/Bluetooth-Receiver-Keyboards-Controllers-USB-BT400/dp/B00DJ83070

Their are windows drivers but not for mac since it uses the same Broadcom chipset.

Is there another command that I can use that will keep it connected after reboot?

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2
  • What kind of external adaptor are you using? Is there a driver required for it and did you update it to the most recent version already? Which version of macOS are you using?
    – nohillside ♦
    Commented May 31, 2020 at 13:15
  • sudo nvram bluetoothHostControllerSwitchBehavior=always Saved my day!
    – flapjack
    Commented Sep 27, 2022 at 20:22

1 Answer 1

Reset to default
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I think that the macOS system integrity protection is stopping your external Bluetooth adapter from getting reconnected after a restart.

You could disable the system integrity protection (https://www.imore.com/how-turn-system-integrity-protection-macos) and try again, but this is not a permanent solution since you shouldn't disable the system integrity protection.

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2
  • If I disable SIP and make my changes and re-enable SIP would I be able retain those changes and still be able to have protection?
    – ratsuns
    Commented Jun 1, 2020 at 23:26
  • Yes that works!
    – Laurens
    Commented Jun 3, 2020 at 4:37

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