The up-to-date version of ePMP on-board GPS firmware (as of Software Version 2.5.1) is AXN_1.51_2838.
To view the version of your on-board GPS firmware in the web management GUI navigate to Monitor > GPS or Tools > Software Upgrade.
Note
If the “GPS Firmware Version” under Monitor > GPS shows “NOT AVAILABLE”, it means that the on-board GPS chip has locked up. A power cycle of the ePMP unit is required to restore the connectivity to the chip before performing the GPS firmware upgrade.
If you are receiving a message to upgrade the GPS firmware, see How do I upgrade the ePMP onboard GPS chip firmware or the ePMP User Guide for instructions.