F.Port Enable FrSky R-XSR Receiver

Vampire on SBUS pin

Follow this guide to vampire wire pad P (F.Port) to pin usually used for SBUS
FRSKY R-XSR FPORT MODIFICATION

Get Updated Firmware

FrSky has the latest firmware for the R-XSR Receiver on their website. I downloaded the ACCST D16 Firmware v2.1.0 Unzipping this file, there were several options, I selected the RXSR_ACCST_2.1.0_Fport_LBT.frk since I wanted F.Port and also to try LBT (listen before transmit).

Burn Firmware onto RX

Use your radio to program the RX I have a Radiomaster TX16 so I used this guide:
YouTube Painless 360 RadioMaster TX16s: Flashing/Updating Radio Receivers (Simple Process)

Bind RX to RadioMaster TX16S

I set my radio in the Model menu to: MULTI: FrSkyX2 LBT 8ch I powered up the RX with the bind button pressed and then selected bind on the TX, the red light flashed to confirm binding. I power cycled the RX and the green light lit up confirming connection with my radio.

BetaFlight Settings

Flight Controller: GEP-F4-12A

Ports: UART2 Serial Rx on

Command Line Interface (CLI):
set serialrx_halfduplex = ON
save

Receiver:
Serial-based Receiver (SPEKSAT,S.....

Serial Receiver Provider: FrSky FPort

Other Features:
Telemetry On

Tune Multi Protocol module

DIY Muli-Protocol Module Git Hub Frequency Tuning
Oscar Ling HOW TO “FINE TUNE” FREQUENCY T16 TX16S MULTI-PROTOCOL MODULE