Hello I got the following error in the avionics section Any idea ?

Tried to test in opens space but it refuses to start ...Any idea please ?

Updated batteries?, charger, RC, aircraft?

Yes - I am not sure if the batteries have a successful update. Is there a video to check the correct procedure?

no. didn´t see any video. have you got the chaging station?
connect it with batteries inside via USB to the smart controller.

Of course there is the charging station-there is no other way to charge batteries with matrice 300.
I have already tried this with the batteries installed...

Of course there is the charging station-there is no other way to charge batteries with matrice 300.
I have already tried this with the batteries installed...

It sounds like you need to upgrade the firmware to the charging case with the batteries inside the case not the drone. to do this remove the batteries from your drone put them inside the case and connect the case to the smart controller.

I am pretty sure that I did that and nothing changed

Batteries replaced by the company. Problem solved !!!