Hi I'm experiencing the exact same issue as https://intofpv.com/newreply.php?tid=19533.

I've tried multiple UARTs for both SBUS and Smartport, and neither are working.

The receiver is bound to the transmitter and I get RSSI on the transmitter. 

Flashed with latest Betaflight 4.3.1.

Here are the issues:
- Softserial enabled, but no softserial ports are visible in the Ports tab. CLI softserial feature is enabled. So weird.
- Connected the receiver SBUS to the UART1 and Smartport to the UART3 (TELE) pad: no receiver connection and no telemetry.
- Tried CLI adjustments for serialrx_inverted = ON, tlm_inverted = ON, tlm_halfduplex = OFF: no improvement.
- Receiver tab not registering any stick movements, 
- Also tried re-wiring receiver to UART RX2 for SBUS, no love 


I checked the FC manual here: https://docs.google.com/viewer?url=https...format=pdf

Compared the resource mapping and appears the same in my config.

Why would softserial ports not show up in the Ports tab?
Why would my SBUS not work on either UART1 or UART2?

Thank you so much in advance.

I got it working. Just had to play more. Rookie error, had the SmartPort and SBUS wires crossed *facepalm* and serialRX inverted needs to be ON.