4. Check the FW version after upgrade.
4.1. The way to open factory menu.
(1) Connect signal source to monitor and turn it on.
(2) The way to factory menu: DC off and pressing the "1" key and DC on, when the screen lights, release the "1" key to
open the menu with "F" and sele
(3) Select "F" to open factory menu.
DC
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