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This post was edited by shenka79 at 19:40, Oct-12-2015
It's a matter of taste. I think the demand to upgrade to android 5.0 or 6.0 marshmallow lollipop is not responded by Xiaomi. But it is not easy also for the MIUI team design a lollipop android system for all Xiaomi devices. MIUI team has not finished making the upgrade android 5.0 lollipop, Google has released android 6.0 marshmallows. This may be the case, I think it's better just to android 6.0 marshmallows are better equipped to handle 64bit architecture. But the MIUI team still preparing Android 5.0 lollipop for all devices. This in my opinion, I also wear the Xiaomi device but I really appreciate the hard work MIUI team.