How to revert back to Kitkat from lollipop?

[AC Question]

I downloaded the Lollipop 5.0.2 update in Lenovo A6000 but have not installed it yet.
1.) how do I delete the file?
2) how to revert back to kitkat from lollipop?

please help me.

 

[belodion]

Try a Cache Partition wipe.