Hello,

I have Rushfpv Blade Stack (for dji) and am experiencing some difficulties.

Main task: I have to reverse 2 motors

1. Connecting to bheli32:
Do not recognize ESCs, and gives message about FC old firmware

First message: found no valid esc configuration
Second message: found outdated 4 way-interface revision

Considering, old firmware is a problem - Updating firmware:
I do not have experience with bootloaders, which is used in this FC.

I have downloaded Zagdig, and insert cable with pressed button.
FC appears as Undefined and I cannot reinstall any driver.
As a conclusion firmware could not be updated as well.

Nithing helps: drivers updates, different pcs, etc….

Could you please advice, what is problem here? 
I know there is something very easy.

What is correct sequence of actions in case of bootloader?

P.S. FC connects to betaflight correclty (COM6), motors spinning, all is fine.
have tried 3 different windows PCs

I have investigaet all internet, have seen all videos and solutions.

Just remove all components from fc

As I have mentioned: I have been missing something really minor