Epson WF-7840 Firmware Update.
Log into the Epson by going to https://10.60.XXX.20. XXX will be unique for each site.
Go to Device Management | Firmware Update.
Click the blue Start button.
If there is a Firmware update the screen will refresh and you will need to check the accept box and click the blue Start button.
The Firmware will update and the printer will automatically restart.