This article provides instructions on how to access the factory OSD menu on the ET1302L monitor

When the unit is powered on while holding the "Select" button, a "Factory" menu will become accessible in the OSD.
Use the arrow keys to navigate to the "F" option, then press the "Select" button to enter the factory OSD menu.



Below depicts the 1302L Factory OSD (Note: the firmware version is shown at the bottom of the menu. In this screenshot the firmware version is REVD)