Filed Under (LG Android Phones, LG Optimus Series, LG Phone Problem and Solution) by lg-phones on 24-09-2012

This tutorial explains how to flash your LG Optimus 4X HD back to original firmware using the KDZ firmware updater from this site. With this tutorial you will be able to upgrade your LG Optimus 4X HD from any country. LG Cell Phone Software

  1. Download these 3 apps:  [Mirror]
  2. Install B2CTools
  3. Extract the (ex.: C:\KDZ\)
  4. Install msxml.msi (located \KDZ)
  5. Extract to the same folder as KDZ (ex.: KDZ\WindowsEnabler)
  6. Run LGMobile update (must be on your desktop) and install the usb drivers
  7. Reboot your LG Optimus 4X HD in SW Upgrade mode (remove the battery, hold vol down while inserting usb cable connected to your pc)
  8. Open the Windows “Device Manager” > Modems > disable the LGE Mobile USB Modem
  9. Run as administrator KDZ_FW_UPD.exe
  10. Run as administrator Windows Enabler.exe
  11. After run the app, an icon will appear on your tray, single-click on the icon until the “ON” text appears over the icon
  12. Go back to KDZ, locate press on the yellow folder and locate the .kdz file that you want to flash
  13. Select Type : 3GQCT. Select PhoneMode : DIAG
  14. Click on “Launch Software Update” and don’t click on anything else
  15. WAIT until your phone reboots automatically (5-7 min) and unplug the cable. Don’t care about the errorlog, it’s normal.
  16. And you’re done! Cheers

If you got only bootloop after flash .kdz, just do a hard reset: press and hold [vol -] and [power] until you got the “android recovery figure” and wait until they reboot again.

Warning: I will not be responsible for any damage of your device. Do it at your own risk! Has everything involving flashing, it always has its risks!

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Avi on 19 December, 2012 at 4:05 am #

this was the easiest guide ever.
great job! 🙂

edgar on 27 December, 2012 at 8:33 pm #

whats 3 files, i only see one kdz-update

Anonymous on 6 April, 2013 at 6:18 am #

edgar, these files are compressed into a ZIP file… download the zip and unzip it. you will get them, enjoy.

Loloto on 14 May, 2013 at 6:44 am #

Hi, it needs to be root to flash the phone?

Aiden on 5 June, 2013 at 9:24 pm #

Yeah i have the same question….Do i need to be rooted to do this?

Guillermos on 28 June, 2013 at 4:52 pm #

Una pregunta tengo cyanogenmod.. puedo instalar esta rom sin problemas?

João on 14 July, 2013 at 12:10 pm #

I had to make a factory reset after installing.
I don’t really know how to get there but I think you have to keep the [vol -] and [power] after plugging in the battery.

Chakrfoc on 13 March, 2015 at 1:35 am #

for a first time didn’t work but i make the same step again and it works and i had to make factory reset…. thanks it help me very much

Anonymous on 2 February, 2016 at 7:57 am #

thanks it helped me to finish my work, i have spent about 8 9 hours before i got this post, after this page it took only few mints to complete my work thanks a lot…

Anonymous on 15 June, 2016 at 1:55 am #

Links do not work, i cant download those 3 apps you said in step one. Please put new links and check them.

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