[Solution] Bluetooth device missing when booting macos but present in other OSes

[Overc1ocker]

Recently I had an issue where the intel bluetooth device or "Bluetooth HCI" would not show up in macOS. The result is that the IntelBluetoothFIrmware.kext would not load and kextstat confirmed this. This is not a kext problem. It's most likely an issue with your machine. So before blaming the kext, check these 3 things!

1. All USB ports must be properly mapped
2. If you still don't see the bluetooth device, some firmwares block it unless you are booting a known OS, such as WINDOWS or LINUX. Therefore you must tell your laptop you are booting a OS it recognizes. Use SSDT-XOSI to do this.
3. If you are Monterey, you must NOT have intel bluetooth firmware injector kext enabled. It WILL cause problems!!