Reset the TV to factory settings? Netflix is not working anymore?

My
2

I have a 55 inch 4k UHD OK TV, with YouTube and Netflix

For a while, Netflix but not open, one knows how I can reset the factory settings?

Sh

https://manuall.de/audio-tv-foto/led-fernseher/ok-led-fernseher/

se

This is in the manual.

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