Additional comment: after sending an email to the seller, it shipped to me immediately another device (new version according to his explanations), which works correctly.
VAS may be described as very reactive and efficient! ... To see if another failure.
The new charger received (called a "new version better" by the seller) and broke down after two days ...! Nothing works, even using a different USB cable or other smartphone ...
I await the response of the VAS. The seller seems serious, but what he sells is of very poor quality ...