nsdn-w59 and nscn-w59c: 

1. press and hold the round button in the middle on the left side and blink 3 times,
2. then the button in the upper right corner on the screen,
3. then the 3rd button in the right column on the screen ,
4. then the 3rd button in the right column on the screen is done.

#sdn-w59 and nscn-w59c

#nhzn-w57: 

1. press and hold the “menu” button and blink 3 times,
2. then the button in the upper right corner on the screen,
3. then the 3rd button in the right column on the screen,
4. then the lower button in the left column, then the second button, done.

nhza-w59g 

nddn-w58

nhzt-w58g

nhzd-w62

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nszt-w62g: press and hold the round button in the middle on the right side until the screen brightness settings appear,

then touch the screen 7-8 times on the left side,

then the 3rd button on the screen,

then the 2nd button in the right colum.