Hi, I've got the same and managed to get it working today!
I used an SD card to burn the latest 8,2 image to it ( LibreELEC-S905.arm-8.2-8.1.5.img.gz )
And used the new device tree for 3gb ( gxl_p212_3g.dtb )
Used an empty update.zip in the root of the SD, to update it with the installed update app in the Android software.
Works like a charm!
Wifi works as well.
After this I installed LE to the internal system.
I am planning to purchase the same one.
Did you try to use wireless air mouse? On my Android S812 I am using TSM01 and wonder will it work on Libreelec too.