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!