I have found many forum post and experienced this myself. When trying to set up MinimOSD using mission planner 1.3.30 on a Walkera DEVO-M(a version of APM) the new settings can be written using “write” and all appears well with the world. However if you refresh parameters from the quad to MP some of them change. In my experience the parameters that changed seamed random. I would correct 3-4 that did not “stick” but when I refreshed again 1 or 2 others would change. If I attempt to correct those, others (or some of the previous) would change etc. I read in other users posts that reverting to 1.3.19 or 1.3.5 would allow the changes to “stick”. I personally uninstalled 1.3.30 and installed 1.3.19 and the setting “stuck”. what is the difference between 1.3.30 and 1.3.19 regarding the SR0 and SR1 settings.