I have updated the card and I can connect to ardupilot but in the correct way I think.
Here is how I do it :
cd arducopter
sudo /home/pi/ardupilot/build/navio2/bin/arducopter -A udp:<IP_OF_MY_ PC>:14550
Then when I open Mission planner it connects automatically on UDP14550-1-QUADROTOR. I have access to telemetry info and can caliber the accel and compass.
If I disconnect to dowload the firmware (which also doesnt’t work : Failed to detect port to upload to (Unkwon VID/PID or Board String)).
I can’t reconnect through mission planner.
I also try to plug a usb cable on the Rpi4 and an ethernet cable but my PC doesn’t seem to recognized the board.
What can I do next ?