Epson T88v USB MODE
How to Activate the USB port on an Epson TM-T88V First, the USB port is located under a plate on the back of your printer, to the right of the power connection, held on with a single screw. Remove the screw and plate to access the USB port.
Power off printer
Power printer on while holding the feed button until the printer starts printing a self-test
After the self-test prints, hold the feed button for a couple of seconds and a menu of options will print
From this first menu, select option 3 by pressing the feed button 3 times, then holding it down for a couple of seconds
From this next menu, press the feed button 10 times, then hold it for a couple of seconds
On this last menu, select option 2 by pressing the feed button 2 times and then holding it
Press the feed button (and hold briefly) to exit.
The USB port is now enabled. Turn the printer off & back on again to use.