To hard reset the Lenovo K4 Note, first you have to hold the power button for a few seconds. After that tap the Volume Down and the Power button at the same time. After a few seconds, there will be an option for resetting your phone. Select yes to confirm the reset.
If anything happens in your phone, you can get it repaired from the service center. The Lenovo K4 Note has servic center all around India. You can check the service center list in its official website or by calling the toll free number 1800-419-7555.