Need to Flash i-Life WTAB 970 with lollipop 5.1

Hello Friends,

I recently purchased i-Life WTAB 970 which came with Android 4.4.2 Kitkat and 16GB internal memory. However Internal Memory is divided in 2 partitions and 1 for Apps is only 1 GB which is not sufficient to run apps smoothly on this tablet.

Is there a way to increase this internal memory partition to 3-4 GB at least. Or flashing it with lollipop 5.1 create a unified internal memory partition?

Can you please guide me to flash this tablet with lollipop 5.1?

Thanks in advance.