GL-E750 Does Not Work with AT&T SIM

I’m using a GL-E750(Mudi) with EC25-AFFA module, and cannot get it working with an AT&T SIM. I’m using firmware 3.105. I have attempted the instructions from the AT&T Network Fix several times. Although all the AT Commands enter successfully, I never get a “Broadband” APN option.

What else can I try? Thanks for any help!!


Does the UI show carrier detected?

Make sure under modem you click manual setup and you can add it in there. Also use usbtty3