I didn't find much information about this setting, I read instructions that at Low latency default is 33 http://copter.ardupilot.com/wiki/common-optional-hardware/common-telemetry-landingpage/common-3dr-radio-version-2/ but if I check standard Mavlink it's changed to 131,( that suposse to give me better range) but that window appears white (the rest grey), then I have 131 in the two windows (local and remote) I save settings and close the window but when I open again, the setting 33 is again there as if it not saved, How I can save 131 value? thank's.