How to customise Navigation buttons on HTC phone running Marshmallow

And Sense 7 I would like to add. Navigation buttons are simply the home and such buttons on the lower part of the screen.

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How clear cached data for all apps on HTC phone running Marshmallow

Yes, this is safe. This will not remove anything you need. And, yes: this works the same way on most HTC phones running Marshmallow including One M9. Continue reading How clear cached data for all apps on HTC phone running Marshmallow