USB input not working with ROON, Devialet Expert Pro 220

[disarmamant]

"Devialet menu" = selecting USB input as active in the Devialet menu using Devialet remote.

Yes, USB input is selected on the Devialet.

I also tried removing the SD card and trying it on the USB input in factory reset. Still no luck.

Official USB ASIO Driveris are supported only for Windows and MacOS: You find the ASIO Drivers on the Devialet Support side.

You are using roon Rock which uses Linux as OS. This is your issue. Linux in principle does not need a USB 2.0 Audio Driver (non ASIO). But if that works iwith roon Rock and Devialet I don't know.
Devialet and roon Rock (Linux) prefer roon RAAT.  IF you are installing roon on Win also Devialet AIR works as well as the Devialet USB ASIO Drivers.

I also have LMS, Lyrion Media Server (Formally Logitech Media Server), running on a Linux Mint NUC i5 PC and a Raspberry Pi4 which runs PiCore Player to play files from the LMS. The PiCore Player on the rasberry Pi is also Liunx based, but It will play some files to the Devialet Expert via USB. However it it will not play 24/96 or 24/192 Flac files without dropouts.

I have been in contact with Devialet support regarding the USB issue. But so far they have no answers.