Gefen DVI MATRIX EXT-DVI-16416 - Manual (Page 52)

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WEB INTERFACE
Set Input to Default EDID
Set Default EDID
Place a check mark next to the input(s) that should be set to the default EDID.
Click the Set Default EDID button to apply the default EDID to the selected
inputs.
Set Input to Default EDID
Press this button from the Manage EDID screen to access this
menu system.