No write permission in /system after rooting with Kingroot

After rooting my Sony Xperia M2 Dual using KingRoot, Still unable to get write permission in /system, /data or / directories. Tried running custom mount command in "su" but always getting "mount: operation not permitted" or "permission denied" error. For this problem, I can't use Link2SD as it is unable to create mount script.

How can I get write permission there?

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