There are two steps:
1. Open port: Due to from v20x (6.0), LG has closed port in download mode and we cannot send command as v10x (5.x). But we found a trick to open port: Using LG Up with v20x.kdz, start up firmware and quickly unplug cable when process reach 9% in PC and the COM no.X appears in download mode of your G4, it meant port is opened.
2. Using dd .... command to inject the system.img file as inject rooted image at LP.
1. Open port: Due to from v20x (6.0), LG has closed port in download mode and we cannot send command as v10x (5.x). But we found a trick to open port: Using LG Up with v20x.kdz, start up firmware and quickly unplug cable when process reach 9% in PC and the COM no.X appears in download mode of your G4, it meant port is opened.
2. Using dd .... command to inject the system.img file as inject rooted image at LP.
Last edited: