Hello, I am currently using a FrSky taranis lite with an R9 M lite pro module on it. The receiver that I have is the R9 MX. The receiver and controller are currently bound together and working fine using the Sbus port connected to a rx pad on my flight controller. I want to switch and use the F.port on the receiver though. I found online that there is an option you have to change in the settings of the controller by going to your bound receiver and selecting options (for whatever receiver is being used so R9 MX in this case) and then selecting F.Port. I tried to do this and the controller gives me a "waiting for RX" message but then nothing happens. I have tried powering the receiver off and back on and still nothing. Has anybody seen this issue before?

If you have “ waiting for RX” it means your receiver has no power to it. With the props off turn your radio on. Then plug in the lipo. Then go into the menu to read what’s on the receiver. There was a conversation about this a few days ago. Read this I think it might help. If your using accst you need to flash firmware.  If running access try the above. 
https://intofpv.com/t-r9mm-f-port-f4-mam...-need-help