RSSI error

Hello everyone, I’m newone here but it seems completely look like ardupilot discourse :grin:

My problem is when I’m using fr-sky XSR then I received completely rssi value on jumper t16 but now I received jumper R8 receiver and I update t16 but now I can’t find rssi value , all tryes is error

What can I do ,
Thank you :slightly_smiling_face: