Default LTE Ver. cant play YouTube HD/HQ

I just bought the LTE version. The problem is whenever I want to watch YouTube videos using the apps, I can't watch it in high quality even though I already click the HQ button (using data). The quality is really bad. I also cant watch HD version using WiFi. I already click the HD button but the quality still really bad. Any way to watch it in high quality using YouTube apps? The only solution I got is watching it using browser with flash support. But I want to watch it using YouTube apps which is more convenient. Thanks.

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