lenovo K4 note

Recently I updated my phone lenovo K4 note to marshmallow, am not satisfied with marshmallow. I am facing lots of problems like fast batter drain, phone gets hang while call receiving, wifi not detected after restarting and many more. Lollipop was working fine, I am thinking is there any way to get back with lollipop.
Your small help will be appreciated.
Thanks in advance.

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