Why does my wifi router keep giving PIN error?

Question

WiFi

Good day, I have a router at home with the ability to connect a 3G modem, I bought another megaphone operator modem, it works, but after a connection break, it can’t connect back because it can’t save the configuration, while trying to save it writes The PIN can not be empty , I can not understand what PIN is in question , SIM card PIN is not empty , tell me what is the problem ?

Answer 1

What router, what modem, why does it try to save the conf when it breaks - hell knows, guess it's called.