The Ethernet Gateway Version 4 provides a means of performing firmware upgrades to both itself and to most Packet Power wireless monitoring units.
A list of firmware releases is at Firmware Upgrades and Version History
Contact email@example.com for the desired firmware file. Note that firmware upgrades are only available for Gateways under warranty.
Upgrades are performed via the "System" page of the Gateway web console. After you receive the firmware file, follow the instructions on the Console - System page.