Unable to configure the Radio in the mission planner with the Pixhawk 2.4.8 and Radiomaster RP1 ELRS Rx

Hello,

I am currently using Pixhawk 2.4.8 with the Radiomaster Tx16s along with Ranger ELRS kit which comes with Ranger TX and ELRS Rx. I am facing the configuration issue i.e i have successfully binded the RX to the TX. But when i try to do the radio configuration it doesnt register any kinds of input i have tried to change the protocol and installed the new firmware and all but it just doesnt work. I have tried it in serial 4/5 port and both the telem ports but noting changes.

Can anyone help me with this issue.