If you can access your phone's menu, use this safer method through the Settings app

If your phone still has issues after a hard reset, the problem may be hardware-related (faulty battery, motherboard, or screen). In that case, contact the nearest Itel service center for professional repair.

A hard reset will erase ALL data on your phone (contacts, messages, photos, apps, and accounts). It will restore the phone to the exact state it was in when you first bought it. Back up your data to Google Drive or an SD card before proceeding.