Connect an ethernet cable to the red LAN port on your device
Unplug and plug your S300 back into power
While it is booting up, press the Function Key when the screen says "Self-Test"
Once the device loads, tap MENU on the bottom right
Press 4 for Remote Installation
Press 1for New Installation
Press 1 for TCP
The screen will say Remote IP Enter 216.238.144.195 and press the green Enter key To enter a . press 1 followed by the Alpha key until it shows a period
The screen will say Remote Port Enter 8252 and press the green Enter key
The screen will say Terminal ID Enter 30030097 and press the green Enter key
The device will download several files and reboot
Download the File
Tap Menu
Tap Communications
Tap Main
Tap LAN
Press Red X until you are the idle screen
Tap Menu
Tap System Settings
Tap App Management
If prompted for a password use the current date Example: June 2nd, 2021 would be 06022021