Asus VS239H Service Manual page 50

Service Manual
8.5. Check the FW version after upgrade.
(Note: Take below figs as an instance)
8.5.1. The way to open the factory menu.
(1)Connect source to monitor, and turn it on.
(2)Press "menu" key and AC on simultaneously. when the screen lights, release the "menu" and then press
"menu" again to open below menu and select "F" to open factory menu.
(3)If the version is right, please do factory reset in user menu as fig12, or re-upgrade F/W as the above steps.
50
ASUS VS239H
Check this
F/W version.