Error Code -251

Hi i have the GL-X750 Spitz. I am putting simcard in the tray and trying to do it Automatically but always saying errorcode -251, tried rebooting and updating still with no avail. I have comb the reddit area for errorcode -251 but nothing has been posted. Ihave tried doing it manually but still unable to confirm due to errorcode -251.

Can anyone help please, i just wanted to have an internet on the modem using cellular.

Thank you

Can you give a screenshot of the error -251?

I have the same issue, my router was working fine but now won't work with the sim. I've reset the router but is coming up with an Error 251 when I try to set up the SIM card. The card works fine in other devices. Any ideas?

Upgrade to 4.0?

Can you give some screenshot of trhe "-251" error? I don't know what it is.