I purchased this device on launch date in march month, it comes with lolipop version. Till now there is no update related with marshmallow version. I have also lenovo tab 2 a 20 device and the same problem with that device.
2nd problem of this device is it has only half hour of video recording system, if I want to continue my recording then I had to press recording icon again, while other device like redme and samsung, lg come with endless recording feature.
3rd problem is if you use any gaming software or doing any multitasking work then this device heated.
If company solve these three problem of this device then there is no other device like this in this range