For flashing low-end LG phones, you can use KDZ Updater for flashing KDZ files as described in our previous post here. But while trying to flash high-end quad-core LG phones with KDZ Updater, you will be stuck at “extract file error” while KDZ Updater tries to extract the necessary files. For flashing these > 1.2 GB KDZ files, you need to adapt a different approach as mentioned below:
When you need to follow this guide?
- If you want to upgrade your phone to the latest version and are unable to do so via online upgrade.
- If you tried rooting or some other stuff and got stuck in the middle.
- If your phone is soft-bricked, it can only be revived by flashing the full stock firmware.
- Download and install LG mobile drivers from here:
- To make sure you don’t have any other instance of B2C installed already, go to Command Prompt and run this command:
- Now download and install B2C app from here:
- B2C installation might take some time. Successful installation will result in auto-run of the program. You need to close it before proceeding.
- Download Flash Tool from here:
- Connect your LG phone in S/W download mode to any USB 2.0 port on your PC and let Windows install the drivers.
- Unzip the downloaded Flash Tool archive. Inside it, you will find “Windows Enabler” application. Right click at it and choose “Run as administrator”. You will see “Windows Enabler” icon in the notification bar. Left click at this icon once so that it turns to “ON”.
- From inside the same archive, right click at “Up TestEX” application and choose “Run as administrator”. This might also take 10-15 minutes on first run. Be patient. After a while, “R&D Test Tool” will open.
- Change ‘Type’ to “3GQCT” and ‘PhoneMode’ to “CS_Emergency”.
- Select your desire KDZ file by clicking at the folder icon next to ‘Select kdz file’. Refer to screenshot below for reference.
- Now click at ‘Normal web upgrade test’.
- In the new window that opens up, choose ‘Upgrade Start’.
- In the next window, just choose “OK”.
- Now phone flashing/upgrade will start.
- Don’t remove USB cable or batter from your phone during the flashing process. Your phone will restart at 90% but leave it connected until Flash Tools shows you 100% activity.
- Congratulations, your phone was successfully unbricked/flashed/upgraded!