After installing a number of additional programs and taking over the adrv from the F96CE3 (save file replacement). Everything works great so far.
Since I don't need the applications in ydrv I left this one out.
I noticed one little thing:
The applications blueman and bluez are built into base.sfs, but the necessary libraries are in ydrv.sfs.
Bluetooth therefore does not work without ydrv.
The affected libraries are:
ydrv_fossapup64_9.6.sfs/usr/lib/x86_64-linux-gnu/libbluetooth.so.3
ydrv_fossapup64_9.6.sfs/usr/lib/x86_64-linux-gnu/libbluetooth.so.3.19.1