[q] how to upgraded android and downgrade android topic

I wanted to hack some apps and games but I got to know that it should have android till kitkat and I am having 5.0.2 lollipop so when I degrade my lollipop version moto g to KitKat 4.4.4 . After that can I upgrade my phone to lollipop by going to settings>about phone>systems update(will there be upgrade available?)