ngại dịch quá, các bạn làm theo hướng dẫn dưới ( dễ hiểu)
restore lg g2 to stock firmware (.kdz) - khôi phục lg g2 về rom gốc
method 1: nếu làm theo cách 1
  • download the appropriate firmware file (link above) depending on the model number of your lg g2 and extract the zip (if applicable).
  • download and install lg usb drivers on your computer: download
  • make sure you phone has at least 70% battery juice.
  • enable usb debugging on your device from settings> developers options. see detailed guide here.
  • download lg r&d flash tool and other files: lg_kdz_fw-update_offlinefix.zip
  • extract the zip file and open the unzipped folder. it contains all necessary tools and files.
  • also download this zip and extract it: lgmobileax.zip (mirror link)
  • now open lgmobileax folder and copy its contents in c:\programdata\ lgmobileax on your computer. the path should be as shown in the picture below. if you get “update r&d tool” error later, delete the contents of c:\programdata\ lgmobileax folderand copy the new files to this folder from lgmobileax you downloaded at step 7.
  • go to c:\windows/system32/drivers/etc folder.
  • now right click the hosts file and open it with wordpad or notepad++ (i used the latter).
  • now add the following line at the end of the document: 127.0.0.1 csmg.lgmobile.com
  • save the changes and close the hosts file. if you are unable to edit the hosts file, do this: go to notepad application on your computer, navigate to the hosts file, add 127.0.0.1 csmg.lgmobile.com at the end and save the changes.
  • open lg_kdz_fw-update_offlinefix folder and install the msxml.exe file.
  • then open shttps folder and run http.
  • now start windows enabler and turn it on (system tray).
  • then launch uptestex_mod2_marwin.
  • now boot your lg g2 into download mode. to do this, turn off the phone, press and hold the volume up key and then plug the usb cable.
  • as soon as your device get connected successfully lg r&d test tool will launch.
  • now click the folder icon at select kdz file option and add the downloaded stock firmware with .kdz extension.
  • then click the normal web upgrade test button.
  • you’ll see a new read phone information popup window.
  • now click the start upgrade button.
  • just wait for a few seconds till you see another popup asking you to select country & language.
  • finally, click ok to proceed with firmware installation.
  • when the firmware flashing is done and your g2 boots up, do not forget to perform a factory reset. to do it, press and hold the volume down+power buttons until you see the phone’s screen.


method 2: nếu làm theo cách 2
note: this method requires all preparations (till step 17) and files mentioned in method 1.

  • open lg_kdz_fw-update_offlinefix folder and run automatic offline procedure.vbs.
  • r&d test tool window will appear.
  • select the firmware file with .kdz extension.
  • click the normal web upgrade test button.
  • then click start upgrade.
  • when you see select select country & language popup, select a different country than republic of korea.
  • firmware flashing process will start.
  • wait till its completes. done!
done! your lg g2 is now running the newly installed stock firmware. enjoy!