I’m currently trying something similar and encountered the same problem. The difference is that I added a new parameter, so I have quite a bit of freedom with setting it up. It’s basically a boolean parameter for enable/disable that I want to be able to switch using a 2 state switch on my remote. I tried different values, starting with 0 (diabled) and 1 (enabled), which didn’t really work out. I tried to increase and decrease the upper and lower bounds, also tried to make it symmetrical and then have the center value at zero. But none of that worked completely so far. The only thing that I got to work half way is setting my enable to some high value and leaving disable at 0. Then I can set up param tuning to switch between disable and an unknown state (with a seemingly random number). In any other case, no matter what I enter in the ‘Set RC to Param’ window, it always resets to min=-2147483648, max=2147483647 (upper and lower bound of a 32 bit integer) and a seemingly random center value. So very similar to what the original post stated.
I’m guessing that it’s not really a good practice to switch parameter with two states via remote, but I’d really like to get this to work, so that I can change the parameter in flight. Has anyone ever tried to do this or has experience with the param tuning feature in general?