SR1 parameter can not be changed

Hi,
I am trying to tune my crossfire diversity RX connection to MP via bluetooth because I have a lot of connection problems. Whenever I change any SR1 value and save, after a reboot the values stay like this:
SR1_ADSB 5
SR1_EXT_STAT 2
SR1_EXTRA1 4
SR1_EXTRA2 4
SR1_EXTRA3 2
SR1_PARAMS 10
SR1_POSITION 2
SR1_RAW_CT 5
SR1_RAW_SE 2
SR1_RC_CHAN 2

Copter Verion 3.5.7 Missionplanner: 1.3.58 @ Pixhawk 2

what could be the issue?

UPDATE: with APM Planner 2.0.24 it worked. There the values stay the same even after reboot. But when I load the configs in Mission Planner again, the values go back to the original ones.

That is a “Feature” of mission Planner. There is no workaround, AFAIK.

Or … use MavProxy instead with “–stream-rate=-1” on the command line.

Thanks a lot for the hint - I was getting crazy about that issue. I will try mavproxy on a raspberry to improve the bluetooth connection MP and Crossfire.