Hi @tryit, I fear it's going to be much difficult to provide assistance without knowing if Bluetooth stopped working all of a sudden without you making any changes (in which case you could suspect a hardware failure) or after changes you made. In the latter case, only you can provide the necessary info.
No EFI, no bootloader config file, ... I've not crystal ball you know...
If you see the device in IOReg, it can only be your setup.