Hi9 Pro European

I have a Hi9 Plus tablet Serial number: E4G-19072015, it is slow, very often the screen does not respond, the battery drain at the same speed either off or on, in two days, without use, the battery loses 80% …
Is there an upgrade, because it is very difficult to work with it.

New system updates most often slow down the system even more. Try resetting tablet to factory settings.