Hi there,
I recently updated one of my RUTX09 to the latest release 00.02.04.3 firmware revision and it appears to have a bug.
Passthrough mode no longer works, it was functional in the previous release, 00.02.04.1.
I have repeated the update on several other build number models of the RUTX09 (I have 10 units, tested on 4), and all have had the same result, Passthrough no longer working.
I have downgraded back to 00.02.04.1 for now.