ETport and E4 firmware versions
The latest firmware versions for the ETport and E4 are below.
WARNING: Do not install the WattsOn-Mark II -E4 firmware on an ETport (and vice versa).
WattsOn-Mark II (E4 module only): v2.21
https://elkor.net/bin/firmware/etport-e4-2.21.frm
ETport (external module): v2.35
https://elkor.net/bin/firmware/etport-external-2.35.frm
Upgrade instructions are here:
https://elkor.net/bin/firmware/AN2001-ETport_Firmware_Upgrade.pdf