LG Leon Forum

Root [UnBrick Guide]LG LEON LTE - MetroPCS (LGMS345) KDZ Firmware

LG LEON LTE - MetroPCS (LGMS345) KDZ Firmware

I found a way to unbrick the Leon LTE for MetroPCS.

Standard disclaimer: This is for MetroPCS ONLY and is the MS34510D version. This guide is for people who have bricked their phone due to messing about with important files/partitions on their LG LEON LTE and found that it won't boot up and gets stuck in a boot loop. The method used in this guide should only be used as a last resort. Don't hold me responsible if this method doesn't restore your phone or makes it worse. THERE IS NO WAY TO DOWNGRADE BACK TO ver MS34510B after using this method.

LG United Mobile Driver 3.14.1
LG Flash tool 2014 (build 03/07/2014)
After flash tool installation

1. Remove the battery and put it back in.

2. Hold the Volume Up button (ONLY) while connecting to USB Cable

3. The Volume up button needs to be held until it reaches download mode

4. Open device manager and changed the LGE Mobile USB Serial port to COM 20

5. Open the Flash Tool

6. Select Type: 3GQCT

7. PhoneMode: EMERGENCY

8. KDZ : MS34510D_00.KDZ

9. Click on Normal Flash

10. Click on Clear update registry

11. Country: different country

12. Language: English

13. Click okay and wait for the LG Mobile Support tool to recognize the device. It takes a minute or two but the tool will recognize it. The software starts the extraction and re-boots at %100. You can remove USB cable, your device will boot normally, and the device is no longer stuck in a boot loop.

Files needed:

LG Drivers: https://mega.nz/#!oQV3yS6Y!D2JPtEMfHiAXB5E5jC2lfFH8ZIOVLNhEHju28JtYwfI

LG Flash Tool: https://mega.nz/#!BB8UgKCT!YAdGWfYGXGLiV5arZzeSGGivtLlW-BuiKlv_ci2Xp0Y

MS34510d kdz file: https://mega.nz/#!VNtDCb6C!wotJiiw1CfVNTlpxG3XRnsgiLNtUmzB6zj3tkraNB9s



#1 dj rios, Jun 20, 2015
Nice :)

@Unforgiven could you please stick this thread?
#2 MikeHoncho, Jun 20, 2015
may i ask where you found the kdz file for the leon? im trying to get the kdz file for the metropcs lg g stylo...
#3 AP2FTW, Jun 20, 2015
From my knowledge, I think this got leaked from a MetroPCS employee. Since you can't get it by any means unless your an employee.
#4 LitrosNub, Jun 20, 2015
oh really? because i saw this post on xda http://forum.xda-developers.com/showpost.php?p=61453241&postcount=322

apparently there is some lg site i can put my imei or esn into to get the kdz file? i tried googling to find this site but i dont know if the site i found is legit

edit and if it was indeed leaked by a metro employee...any chance he can get the kdz for the stylo?
#5 AP2FTW, Jun 20, 2015 Last edited: Jun 20, 2015
Thanks for the mega link! I'm getting a Leon one of these days! Always good to have the kdz ready
#6 nickyhickey, Jun 20, 2015
I got this from my pc, after the mobile support tool restored my phone.
#7 dj rios, Jun 20, 2015
oh i see...so i guess the only way to know if the kdz for the stylo is posted would be to try the support tool...
#8 AP2FTW, Jun 20, 2015
No because the Support Tool fetches the kdz from LG's server. I already asked Unjustified to check and it is not out yet.

Edit: I will send you a link in PM
#9 MikeHoncho, Jun 20, 2015 Last edited: Jun 20, 2015
unjustified gave me the link to look for it


not posted yet for my lg g stylo :(
#10 AP2FTW, Jun 20, 2015
Does this file remove root? Does it fix bricks? And is it legit?
#11 Rondeau7, Jun 20, 2015
Yes - Root will be removed. Fix hard bricked - not to my knowledge. Stuck in boot loop / soft bricked - it recovered mine.
This is from the LG Mobile Support Tool directory that was downloaded when I did a Upgrade Recovery.. Again it worked for me..as with all things flashed use with caution
#12 dj rios, Jun 20, 2015
I was able to FINALLY unbrick!!! Thank you everyone for your hard work and effort!
#13 Playaz, Jun 21, 2015
wasnt even on update 10d? is there any difference? im on 10b BTW.
#14 antonioblee1, Jun 21, 2015
I think it was an update that broke some methods like Kingroot. Download mode root still works though.
#15 LitrosNub, Jun 21, 2015
There are some minor kernel changes in the new update
#16 MikeHoncho, Jun 21, 2015
Could i also use this method to get my phone back to its original without mods, root even tho it isnt brick.?

I jus dont want this audio mod anymore.
#17 imvgine, Jun 21, 2015
Yeah you could but you will be back to stock rom
#18 mrrom, Jun 21, 2015
Thats fine Ive been looking for ways to get rid of this mod all day since I didnt backup(amatuer move). Thnx for the reply
#19 imvgine, Jun 21, 2015
Is the new software version rootable. I had a L70 that had to be downgraded. So say I flash this kdz and recover my phone will I still be able to root that version of software or no dice.
#20 Rondeau7, Jun 21, 2015
I was able to with a KINGROOT apk. and the SuperSU Me app from the play store. Root has held no errors so far, but again it's worked for me on my device .
#21 dj rios, Jun 21, 2015
Just a heads up to anyone who uses this or has used it. This is stock Metro Firmware 5.1.1, it has been stated that the update locked the bootloader on the T-Mobile version of this device, it might be possible that the same happens to the Metro version. If that is the case I will try to figure something out for the people that have used this
#22 MikeHoncho, Jun 24, 2015
Yes, I realized that after posting.

#23 Nintendo1889, Jun 24, 2015
Take it from me. 34510d for T-mobile version gives you oem unlock enable option in developer options, kingroot and supersu me was my only way of un-bricked or complete root, and im now searching for a way to unlock bootloader or downgrade so i can install twrp. If anyone needs a gineau pig, let me know. Message me on kik @ powduh09 or hangouts @ powduh09@gmail.com... Will gladly test any methods for unlocking. And have everything i need to recover from soft brick.

Also, be very weary what you flash to this device. I had no other option than kdz after i flashed supposedly modified xperia apps for any android device. Couldn't even restore my phone from a twrp of another just like it.
#24 Powduh, Jun 27, 2015
If you have the option in Developer Options then you should be able to unlock that way
#25 MikeHoncho, Jun 27, 2015
Oh :p My phone is soft bricked so hard to do that.

I plugged it in and lg mobile support tool says v10b. If I go into download mode and load the support tool it says 10B with an upgrade to 10E available so should I
  1. Try and upgrade to 10E via the support too?
  2. Use the OP method to flash 10D?
  3. Use the OP method to flash 10E?
It's a soft bricked phone for a month now so I'm not too concerned with what happens to it.
#41 mrmdc, Jul 1, 2015