Beta version of mission planner will not flash new firmware over arduplane 4.1.0beta

I have a FC with arduplane 4.1.0.beta firmware that I cannot get rid of .
Error loading firmware file
System exception : unrecognized token at index 1
These are some of the errors I get in mp .

And it goes on…… no clue what any of it means .
I read in wiki that for h7 fc you have a file with all zeros .
Problem is I cannot connect with stm cube programmer because it says no dfu detected .
That’s what it always says when there is already firmware on fc .
So the rest of wiki does me no good without the ability to connect .
Isn’t there a way to simply erase the memory on these things and start over ?