Firmware version 2.1.0 upgrade is intended to be used over a direct Ethernet TCP connection to prevent delays and upgrade failure risks associated with slower communications connection methods.
Remote display, webpages and option module firmware updates require an FTP over Ethernet connection. You cannot perform firmware updates over serial or Ethernet gateway.
Ensure the computer you are using to upgrade the meter is connected to the same Ethernet network as the meter (physically or through a remote desktop connection).
To upgrade the PM89RD96 remote display firmware, the display must be connected to the meter.
To upgrade option module firmware, the option modules must be connected to the meter.