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ASUS is apparently killing the ability to root present and future Zenfone, Updated
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Samsung unlocked is free to root, and they even provide the tools to do so. Most models supported in the free distros as well.
Yeah, but then you break Knox, and can't EVER fix it. The phone becomes instantly worthless for resale.