Assuming you've got the kexts all upto date try this config. I've added some NVRAM variables that can help with BT not working. Failing that make sure the USB map is correct for where the BT is attached and set to Internal.
As far as I'm aware it forces macOS to use a USB "Dongle" BT rather than a built in device. As our devices aren't actually Mac's it's technically not built in.
You'll see in your System Information under Bluetooth -> Chipset it's showing THIRD_PARTY_DONGLE.
This usually indicates the Bluetooth Firmware isn’t being loaded in macOS. But is being carried over from Windows after a reboot/restart and boot in to macOS.
Are you using the most recent version of the Intel Bluetooth kexts, version 2.4.0?
Do you have the kexts sorted in a specific order in your config.plist? I normally set the kexts in this order for my Intel Bluetooth modules:
Thanks for the hint, I did indeed have 1 and 2 reversed.
This didn't fix the issue at first, but while comparing the versions, I realized that the Firmware kext was only around 3mb and not 11mb, so there must have been an issue with auto updating the kext via OCAuxiliaryTools.
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