The technicians of the Fai SFR 4G LTE box do not know how to solve the problem. They refer me to a private technician. The good joke.
I will definitely change Fai, because I am at the limit of 4G reception
Thank you to everyone who helped me in my process.
Many thanks to the developers for the outstanding work of the latest version.
For me, the subject is closed.
Have a lovely day everybody