Make sure you have enabled USB Debugging
You have any File manager in your phone
1.Download both these files (copy them in your URL) :
2.Connect your device to PC via USB cable. Make sure you are on ''LG Software'' or ''Media sync'' USB connection mode.
3.Transfer file ''IS11LG_SystemBackupTest.signed.apk'' to your phone.
4.Now,using your file manager,install ''IS11LG_SystemBackupTest.signed.apk'' into your mobile.
5.Make sure you are NOT connected to PC now.
6.Open the app ''SystemBackupTest''.
7.You will see a message ''Hello world!'' on your phones screen. Don't close the app.
8.Now,reboot your phone. ! Make sure you reboot your phone while app is on.
9.When phone is rebooted,extract zip file ''My Root Package''.
10. Connect your phone to PC again. Change connection mode to charge only mode.
11. Open the extracted folder ''My Root Package''. Now,run ''root.bat'' if you are using Windows,root-linux.sh if you are using Linux,root-mac.sh if you are using Mac.
12.Once you open your root file,don't touch your phone or computer. Wait for it to complete. After process,your root file will closes automically and you see your device rebooting.
13. If you can find ''SuperSU'' app on your phone after this,contragulations. Your L5 is now succesfully rooted.