@David-TP @Damian_Sz Finally, I solved my problem : when you reset the DECO, you have to ADD a new device on the app. Then you can configure it. everything solved. Thanks

@David-TP @Damian_SZ Hello. This morning, I encountered a total loss of 5G and wifi connection. I reseted the Deco but now I am locked out because the Deco has no Internet... i tested another SIM...