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!