0. Extract P930_v20e_ROOT folder from attached file to C: drive
1. Flash v20e firmware (you can use official tool or UpTestEX_mod2_marwin.exe method)
2. Turn on USB debugging and Unknown Sources
3. Install LG_SystemBackupTest.apk and start it
4. Wthout touching anything press&hold power button and reboot, after reboot your phone must lags (you can see it by unlock in lockscreen)
5. Connect phone to PC and start root_P880.bat
6. Wait until phone reboots several times.
7. If you get root, you can delete SystemBackupTest app that you have installed on 3d step, because phone will lag with it