The update process is described under "Upgrading Pathport Nodes"

Click here to download a zip file containing the latest firmware for all Pathport DMX-over-Ethernet nodes.

The file contains:

ppimage-3.0.4.7.bin      All 2-port nodes

unoimage-3.0.4.7.bin    Pathport Unos only

merger-3.0.4.2.bin        DMX Manager Plus

If you are using Pathport Manager 3, the files will need to be renamed without the numbers in the filename.  Pathport Manager 3 is required to update any Pathport node using 3.0.2.x firmware.

The download zip also includes a file called new-pathway.meta.xml.  This file should be renamed pathway.meta.xml and should replace the file of the same name in the /meta subdirectory of Pathport Manager 4.  The new file is necessary for PM4 to correctly patch custom universes to the DMX Manager Plus.