Digi TransPort's that contain the Telit HE910-D cellular radio have the ability to upgrade the firmware of the radio to the latest version, which includes many improvements over the previous versions.
To tell if your Digi TransPort has a Telit HE910-D cellular radio installed, look at the part number of the device and look for "U9" as the 5th and 6th digits of the part number. An example part number would be: WR11-U9
This module can be found is most TransPort models.
The instructions for upgrading the Telit HE910-D can be found in this Quick Note on the Digi Support website:
Mar 05, 2019