Unfortunately I bought it on Ebay fully refurbished, I contacted the seller and he told me that he was not responsible for it anymore, and I will need to learn by myself to resolve that kind of issue.. This is the deal I accepted of buying things that way, it was cheaper but there is no warranty or anything.... It's very frustrating but my bad
He advised me to update the firmware and contact DJI too, like you tell me
I checked the firmware and it is latest one, v. 1.9.60, so I think it has nothing to do with that
I guess the only thing I can do is wait for the DJI's answer, and when I'll be back to Paris if I didn't fix it until then I will go to a repair shop !