Bluetooth doesn't work after macOS Mojave update

I'm new here. Will someone help me to fix this? I updated my Mac to macOS Mojave and now it cannot connect with Bluetooth devices. Why is this happening and how can I fix this?

it's a MacBook Pro and I tried to connect my wireless headphone. I do not remember the brand.

Solution 1:

I tried all available methods.

1. Deleting files from:
   • /Library/Preferences - com.apple.Bluetooth.plist
   • ~/Library/Preferences/ByHost - com.apple.Bluetooth.xxxxxxxxxxxxxxxxxx
   • and after reboot
2. To reset your Mac’s Bluetooth module
3. Tried through safe mode.
4. Created a new user.
5. Turned off the wifi
6. Made a clean install.
7. Install Catalina
8. Return from backup 10.14.5
9. After replacing the bluetooth board.

** Now everything works! **