Actually MIUI has Android 4.4.2 KitKat.
I repartitioned the ROM partition by following this guide:
https://www.youtube.com/watch?v=L7_jrw9C9Pg
And downloaded the ROM files form here:
https://forum.xda-developers.com/t/unofficial-14-1-7-1-2-201...
China ROM is really bad as it can lead to black screen with the tablet becoming unresponsive.