thank you for your reply.
I contacted Xiaomi France yesterday. They have speculated that the phone has been bricked during the update because it is not compatible in EU (yet it is marked in your product sheet "EU")
He also confirmed that even if I pay them he will be unable to restart it because it must be unlocked beforehand by associating the SIM card with the account Mi and the serial number of the phone. Since it can not be restarted, the off-factory repair is not possible.
They also confirm that I can not use it anymore.
Therefore, if you send me the same model there is a probability that it will start again.
Looking forward to your answer