How to Downgrade LG G4 H815 to 5 1 1 Lollipop Warning This process is only for LG G4 Model-No H815. Do not try this any other phone. If you are completely unaware of this process then you should not do this. If something wrong happens with your phone during or after the process then we will not be held responsible. So, try this at your own risk. The firmware is official. You will lose root access, if you have, after the process, Thanks. Things to remember Check the model of your phone by going to Settings>>About Phone>>Hardware Information. Make sure it is H815 then proceed. Backup your important data like photos, videos, contacts, messages etc to avoid data loss for safety purpose. Charge your phone up to 70% to minimize power issues. Install LG USB drivers on your PC. Your USB Data cable should be working properly. What you Will Need LG G4 H815 A PC or a Laptop USB Data Cable Download Required Files Download: 5.1.1 Lollipop KDZ file for G4 H815 Do...