Wireless Joint

The EM7455 was removed from a US Cellular 961 unlocked for AT&T. Do you have to install firmware for Sierra wireless modules for the network you were going to have it locked to?

GoldenOrb version ZBT WE1326
How do I run a AT Command

I installed GoldenOrb firmware in a WE826. I have an em7455 installed. I have an AT&T sim APN is set to broadband.
Network status
General Information
Modem :
Sierra Wireless, Incorporated EM7455
Modem #1
Modem ID :
1199 : 9071

Provider :
AT&T

Comm Port :
/dev/ttyUSB2
Temperature :
45.00°C ...