@Joseph-TP I tried the trooble shooting options with no success. I also tried another TP-link modem (MR-6400 V5) ans the behaviour is the same. It works fine with my "old" bouygues sim card and not...

I have 2 multi sim from Bouygues telecom, My first multi sim (2023) works fine with my MR600. I also received another recent (July 2024) Bouygues multi sim which doesn not seem to work with my MR600...