Go to your home screen,,swipe down and look for a symbol with a moon..I think you might have it on dark mode..hit the moon symbol and it'll let you know if you want dark mode on or off,..turning off dark mode will let you have the full affect of your themes..
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I have a Samsung gear s3 ,and when I rooted my phone I had to use a later version of Galaxy Wearable App..I couldn't figure out why I couldn't pair my watch to my phone..
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