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My phone screen has turned black and white, how can I restore it to color?

If the mobile phone screen becomes black and white, how to restore it to color; take the operation of Apple mobile phone as an example:

1. First open the mobile phone settings; as shown in the figure below.

2. After entering the page, click General; as shown in the figure below.

3. Then click on the accessibility function; as shown in the figure below.

4. Turn on display adjustment; as shown in the figure below.

5. Click on the color filter; as shown below.

6. Slide the color filter button to the left; as shown in the figure below.

7. Finally, the screen will return to color; as shown in the picture below.