Magicsee N5 Bluetooth trouble

[Skunz]

Hi all,
Happy new year 2019.
Just bought a new s905x machine: Magicsee N5. I performed a smooth installation of CoreELEC 8.95.6 with gxl_p212_2g dtb. I have trouble with internal bluetooth not recognized by CoreELEC. this is the output of hcitool dev command:

Devices:

and this is the output of dmesg | /usr/bin/pastebinit

http://ix.io/1xfM

Bluetooth works very well with an external adapter.

Thanks in advance for your help !
Rgds
Skunz