You have a 2GIG Go!Control (referred to as the GC2 now).
1.9 firmware is very old. That version can’t support 3G modules (1.9.6 was the required version for 3G), and only 4G LTE modules can be registered now. However the good news is you can always update the firmware using a 2GIG firmware update cable.
1.19.3.1 is the latest and what you would need for 4G LTE module to function with the panel. If you are looking to get Alarm.com service with that panel we have a getting started package here that would have everything you need.
Here are some resources for the panel: