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No more than 4.2, gave me failures with the wifi connection, the screen broke falling from 15 cm. Let's see, at the time it was very good for its price, the 15000 Antutu points and the 5 "screen seemed a lot to me, but do not buy it if you find it, really.
The strongest point is the battery, 1.5 / 2 days with MIUI. With LineageOS and the ReVolt kernel it goes beyond 3. The fingerprint reader is very convenient and fast. It is very well built for its price, with a nice design, although I would sacrifice some battery to make it thinner. It has all the 4G bands in Spain and frequent updates. Very fluid and correct screen, although it costs to see with sunlight. If you know you can put a ROM with Android stock 8.1, a third-party kernel and some mods and you end up rounding it. The sticks are the camera at night (although for the price there is no better competitor), the scratch resistance of the screen and the back, has a few and that I only carry it in my pocket without anything else or I leave it over of a table. And MIUI, if you do not like it, of course. I can not stand his notification system.
For what it cost and at the time it went to market has very good performances in terms of performance. Screen with good brightness and very vibrant colors. Battery and cameras are average but not bad for the price. It has all the bands used in Spain and has versions with NFC, so as far as connectivity goes very well. The not so good: the design, not because of aesthetics (that if it is true that it is a bit bland and plastic), but by the quality of construction. I have had to change it for broken USB port and power button, apparently a common problem in this model. The audio is very distorted when you turn up the volume. The factory software is not the best, I think it did not get to go from KitKat via OTA and it was wearing a very ugly layer. I advise your purchase if you dare to play the ROM, have a very good community and even got to upgrade to Android N with unofficial ROMs.
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