If this fails, try admin / epson or blank username with 0000 . If still no luck, the printer may have been previously configured by a POS vendor.
The TM-T20iii itself does not broadcast Wi-Fi. It connects to an existing network via Ethernet or an optional Wi-Fi dongle. The dongle has no default password—you configure it via EpsonNet.
If the web interface remains inaccessible, use the :
