No parameters loaded, stuck on STAT_TIMERUN

Hi guys, I’m tried to load different versions of Ardupilot firmware on my CubeOrangePlus, and tested SRx_protocol/baudrate..
Now when I connect to GCS (Mission Planer/ QGC / Mavproxy) I can nnot get the parameters list, the FC returns only STAT_TIMEOUT , and if I wait long enough , I can get some other paramteres (not all).

Example on MP:

And on Mavproxy parameter editor:

I tried to reset default parameters, but the Cube gives no response, and I know parameters are currently not be changed by GCS request. Loading other firmware versions does not help ( building with waf on LInux or loading firmware by MP)