As topic states, I'm wondering if there is still no solution to the onboard RPi3 BT issue (no adapter found). I'm running LE 9.2.8 on a RPi3B.
I dabbled in this quite a while ago, quickly gave up and bought a USB BT adapter instead. Now I needed it for another board and while I can just get another one, I just wanted to check if it's possible to get the onboard working first. I've searched the forum but I just find the old threads with the recommendations of getting another adapter.
The issue is still the same, despite enabling BT in LibreELEC settings it doesn't activate and the "No Bluetooth adapter found" message is shown. Bluetoothctl can't find an active adapter either. I know the adapter works as I can get it working in Raspberry Pi OS, so there must be some issue with LE it seems.