How to scan image on FPV screen

How to scan image on FPV screen

How to scan image on FPV screen?
PS: we have done this before shipment

The button can press, and also can push in four directions: up, down, left and right.
Firstly, press button, a popup menu will display, choose the first line, it will scan signal automatically.
When clear image appears, push button to left, 
Finally, choose "Exit".

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