Anyone have success with an Express LRS/CRSF RX?

BetaFPV Nano 900Mhz attached to BeagleBone Blue UART5, /dev/ttyS5 mapped using -F to SERIAL_5. SERIAL_5 configured for RCIN (23).

I can clearly see the radio data stream on /dev/ttyS5 using tio but Ardupilot either doesn’t see it or can’t interpret it. Also tried restricting RC_PROTOCOL to just CRSF with the same result.

Arducopter 4.2.1, Debian 10.3 console, PRU is enabled.