MacBook Air Bluetooth completely missing

Hi there,

Yesterday I tried to use my wireless headphones with my laptop, however they wouldn't connect. My Bluetooth icon said "Not Available" and the turn bluetooth on button was greyed out. I have since tried the forums suggestions of deleting the /Library/Preference/ and ~/Library/Preference/ByHost files and restarting, no dice, SMRC, no dice, I also tried the shift+alt+control+power option, no dice, I tried upgrading to Catalina, no dice, so I resorted to factory reset, now the Bluetooth is completely gone... not is system preferences, network, or menu bar, though files are still present in the Library/Preference.

Help?? Suggestions?? Bluetooth Firmware I can reinstall??

TIA.