You’re covering a lot of ground here. You’re asking questions about EmuELEC in a CoreELEC forum but mentioning that you’ve installed the long discontinued OpenELEC.
Here’s a link to the EmuELEC discord and wiki where you should be able to get answers about EmuELEC from the EmuELEC community.
https://discourse.coreelec.org/t/bluetooth-on-emuelec/14776/2?