RSSI half working with jumper t8sg and frsky xm+

Hi there, i have a problem with my rssi value on betaflight . I have a Jumper T8SG transmitter and an XM plus receiver. At the beginning my rssi value ,as shown on BF setup tab and on OSD was a value between 29 and 31 all the time. But the sixteen channel at the receiver tab was dead. After flashing the XM plus and setting the BF configuration the channel sixteen (aux 12) starteed showing the rssi value and it looks working correctly. But at the setup tab and OSD the RSSI values still remain the same, 29 or 30 or 31 whatever i do. Please, Help! i am stuck and dont know what ealse to do!

Setup issue on BF?
Flash the XM+ with the firmware for rssi on channel 8 and set it on BF to the same channel. That´s how I use mine.
The 8 channel version has even a lower latency.

Hi there and thank you very much for your answer. You are telling me that you are familiar with my problem? you had the same isue at channel sixteen? are you using a Jumper too? i supose that we are talking about the internasional firmware because jumper is from china. The internasional is the one i flashed to my XM plus.

No, I am not aware of "your" channel sixteen issue, I only told you that the version/rssi on 8 is working for me on BF.
My rx arrived with the FCC 16 CH /no rssi firmware and I flashed the rssi on channel 8 version.
No need to transmit data for 16 sbus channels while I am using only 6...........
But if you need more than 7channels, this is no option for you.


Edit:
www.frsky-rc.com/xm-plus-mini-sbus-non-telemetry-full-range/

i understand . what transmitter do you use?