LG Volt Forum

Root [GUIDE] Brick Recovery

This guide is intended for recovering from a brick where you can't access recovery or boot the phone. If you can do either of these, you are not bricked and this guide is an extreme solution to your problem. Access to download mode and a computer is required.

Several of the files have an MD5 listed below them. You can use this to verify that the file downloaded correctly. Install this hash checker and compare the MD5 of your file to the one listed. (Android MD5 Checker)

Step 1 - Gather materials for zv3 downgrade
What you will need:
zv3 stock tot file - DL to computer
MD5 = 0D7AAAFB6742CEAB7BCAEECBAE3C1F39
LG Flash Tool 1.8, Megalock, and LS740 - DL to computer
MD5= C1825BA208611B23B9B0D4aBDD0C5731
LG Universal Drivers - DL to computer

Step 2 - Setup your computer
Uninstall any and all phone related drivers and software currently on your computer from any phone you've had. You can reinstall them once the downgrade is complete if you still need them.
Reboot the computer.
Install the driver package.
Reboot the computer.
Install the LG Flash Tool to the root of your drive.
Place the DLLs (megalock and ls740) and tot file in the folder with the flash tool.
With the phone off, and USB cable plugged into your computer, hold Vol + and plug the cable into the phone. (Some drivers may install, allow this to happen.)
Continue holding Vol + until download mode loads. See screenshot.
upload_2015-1-7_17-23-25.png
In Device Manager on your computer, find LGE AndroidNet USB Serial Port (under Ports) and set it to port 41 (COM41).
Leave your phone connected and set it aside for now.

Step 3 - Flashing zv3
Open the LG Flash Tool. On the config window, make it look like the picture below
(note the DLL, S/W, and Action Mode) and hit OK:
upload_2015-1-4_11-55-48.png
On the main window, hit the yellow arrow at the far left.
Once it finishes, unplug the cable from the computer, and plug it back in to start the flashing process.
When the phone reboots, it will boot into the MiniOS setup screen.
(You can now disconnect the phone and close the Flash Tool.
Don't worry about any fail messages from the flash tool.)
On the MiniOS screen, hold power and tap Normal Boot.
Rebooting will take several minutes, DON'T PANIC! :)
If you don't have service, just use ##72786# dialer code to reactivate.



Step 4 - Allow your phone to update to the current version
Once you've reinstalled the stock software, it will need to update to the current version. Doing this on WiFi is recommended as it will take up about half a GB by the time it's fully updated.

Step 5 (optional) - Restore carrier labeling
Flash this universal APN Fix in custom recovery.
http://androidforums.com/index.php?posts/7283452

Disclaimer
As always, the responsibility for the results of this information is at your own risk.
We'll happily help you fix any problems, just don't blame us for breaking your phone.

Credits
Huge credit to asmugone for getting the stock zv3 tot file!
He had to pay for this, so please send him a donation!
Thanks to Team Codefire for creating bump.
Thanks to whoshotjr2006 for TWRP
Thanks to kwknott for the zv5 ROM.

Thanks to everyone else who contributed time and knowledge to getting this stuff working!

 

Related:

#1 bg4m3r, Jan 4, 2015 Last edited: Jul 24, 2016
Thanks bg4m3r, great job! This should be stickied. The currently stickied "rooting guide" is outdated.

Here is a link to version 3.13.2 of the LG driver direct from LG. I have used this version successfully.
http://tool.xcdn.gdms.lge.com/dn/downloader.dev?fileKey=UW00120120425

Here is a link to the latest version of SuperSU (currently 2.40):
http://download.chainfire.eu/supersu

This is not needed when using Flashify as described in the OP, but for anyone who wants access to fastboot and adb, you can use this package without needing to install the whole Android SDK:
http://forum.xda-developers.com/showthread.php?t=2317790

For further reading and to help give more credit to the people to originally discovered/created/shared/consolidated some of this great info about rooting and updating the Volt, here are links to some of the original threads. Thanks so much to all who have contributed, and apologies in advance if I missed anyone or any significant threads!

Restoring with Download Mode:
http://androidforums.com/threads/official-restore-with-dl-mode.853693/
http://androidforums.com/threads/how-to-restore-phone-with-dl-mode.861292/
http://androidforums.com/threads/the-so-you-upgraded-to-z4-and-lost-root-guide.874943/

CWM recovery:
http://androidforums.com/threads/test-a-working-lg740-cwm-based-recovery-v6-0-3-7.862425/
http://androidforums.com/threads/working-cwm-recovery.880181/

Rooted ZV4 Rom:
http://androidforums.com/threads/rom-zv4-updated-stock-rom.872005/
 
#2 spocko, Jan 4, 2015 Last edited: Jan 6, 2015
Where was the page that link for the drivers is from? I would've expected it to be listed on the page I linked.
 
#3 bg4m3r, Jan 4, 2015
The version 4 update has caused SuperSU to stop funtioning, my phone is still rooted how do I get a superuser app to work on my phone?
 
#4 rcolitz, Jan 4, 2015
Use the link in the guide, install with cwm. SuperSU is working perfectly fine on my phone.
 
#5 bg4m3r, Jan 4, 2015
Added additional thanks to the credits as mentioned by spocko. :)
 
#6 bg4m3r, Jan 4, 2015
Thank you very much sir!

Just what I needed. Do we have any custom stable roms on the forum?
 
#7 DanniRulezzz, Jan 4, 2015 Last edited: Jan 4, 2015
There are several in the works, but nothing is 100% yet.
 
#8 bg4m3r, Jan 5, 2015
I don't have a working PC Computer any other suggestions?
 
#9 rcolitz, Jan 5, 2015
You're rooted right? You don't need a computer. If you already have cwm installed, just download the zip on your phone and flash it with cwm. If you don't have cwm installed, it can be installed with Flashify.

Have you tried running towelroot again? It may work since you are at least semi rooted.
 
#10 bg4m3r, Jan 5, 2015
Thanks a lot for the guide, it's a lot easier to follow than the other one.

What effect does this have on my phone's interaction with my carrier? That is to say, I shouldn't have to activate my phone, pay again, or get a new number, right? I assume it's not an issue, but I'm pretty new to toying with android phones, so I figure it's best to ask.
 
#11 sagethesagesage, Jan 5, 2015
First off, thank you for the guide! I'm having some problems with the LG Flash Tool. After "Waiting for connection" I get this error:

PID: NULL
IMEI: Unknown
Model : UNKNOWN
DLL : LS740
BIN : LS740ZV3_17.33030_SECURE.TOT
SW : UNKNOWN
SWOV : UNKNOWN
Device Model is different!
Check Phone or DLL!
00000000
Factory Model Check ERROR!!

Any idea what's going on? I followed the steps exactly, tried 4-5 times, and keep getting the same error message.
 
#12 AndroidEJ7, Jan 5, 2015
Well, first question, and it may be a stupid one, but I don't recognize your name, do you have a Volt? This will only work with the Volt.

Second, did you download the 3.11 drivers? It won't work with older ones, and it might not work with the 3.18 drivers spocko posted (I personally haven't used them).
 
#13 bg4m3r, Jan 5, 2015
Yes I do have a Volt, just got it last week. I did download and install the 3.11 drivers (the ones linked in the OP, correct?). I kinda have a feeling I may be doing something wrong even though I'm following the instructions exactly, just not sure what it could be.
 
#14 AndroidEJ7, Jan 5, 2015
Hey, so I rooted my phone and I'm pretty sure it's rooted, but when I got to the boot.img I was confused. Do you install boot.img as a recovery image or boot image?
 
#15 Jose Flores, Jan 5, 2015
How do I get to the boot recovery?
 
#16 rcolitz, Jan 5, 2015
Boot image... As stated. :)
Cwm is the recovery
 
#17 bg4m3r, Jan 5, 2015 Last edited: Jan 5, 2015
Do you mean how to boot into recovery?
Vol - + Power
 
#18 bg4m3r, Jan 5, 2015
Did you set the port correctly in device manager? Are you running the flash tool on board mode or update mode? Where is the flash tool installed, and where are the other files located? I'm not sure what you could have wrong otherwise.

I used this exact method a couple weeks ago, so I know the process is sound.

Are you using the USB cable that came with the phone? Some cables only do power, or are wired a little funky. Maybe try a different USB port?

On the drivers again, there are three different sets on that page. If you just downloaded the first one, you didn't get the right thing.
 
#19 bg4m3r, Jan 5, 2015 Last edited: Jan 5, 2015
Port is set to 41. Ran flash tool on Board DL. Flash tool is installed to C: and both the .dll and .tot files are located in the LGFlashTool folder. Wasn't using the right USB cable earlier, but I just tried again with the one that the phone came with and got the same result. Installed the LG USB Drivers Ver.3.11 from the page you linked to.

I am completely stumped. When I get to the download screen on my phone and run the flash tool, I see no progress at all. Stays at 0% until I get that error message from the flash tool. Tried enabling USB debugging mode from the developer options and that didn't work. Tried a different MegaLock.dll file that I found online also and that didn't work either. No idea what the problem is :/
 
#20 AndroidEJ7, Jan 5, 2015
The version that I linked is 3.13.2, and I have used that version several times. It comes straight from LG, and I linked directly to the relevant file so no chance of downloading the wrong file. Your link goes to a 3rd party site with multiple download links, so someone could download the wrong file. IMHO I think my link is preferable, no offense. :)

The source page is here:
http://www.lg.com/us/support-mobile/lg-LGV500#software_panel


One thing that is missing in the OP is megalock.dll. You need to download that and copy it into the LgFlashTool program folder, overwriting the existing file. You need to do this before running the LG Flash Tool. There is a download link in the first post of this thread:
http://androidforums.com/threads/how-to-restore-phone-with-dl-mode.861292/

Also, you might want to verify the MD5's of the downloaded files to confirm that your downloads are not corrupted. Here are the MD5's of the actual files that I used, and I just verified that they match the files linked in the OP.

LGUnitedMobileDriver_S51MAN313AP22_ML_WHQL_Ver_3.13.2.exe
MD5 = 5B42B87660CC30168DA629BFD75A105D

LGLS740_20140414_LGFLASHv160_Download.zip
MD5 = 8ADCC4F4BA818C4D6583870CF0717931

LS740ZV3_17.33030_Secure.zip
MD5 = 0D7AAAFB6742CEAB7BCAEECBAE3C1F39

MegaLock.zip
MD5 = F20BFD2743C279186998A53F9B70984A

Here is a tool for easily checking MD5 values in Windows:
http://code.kliu.org/hashcheck/

To sure you are in download mode before running the LG Flash Tool, I attached a photo showing what your phone screen should look like (yours may not say "rooted" yet).

After running the LG Flash Tool, that tool always ended with a "Failed" result for me, even though it had worked. As long as the phone reboots into MiniOS afterward, I think you are ok. If the phone boots into a blue screen saying Status 2 or similar, then you need to try again. That will happen if you use "Upgrade DL" mode instead of "Board DL" mode.

Once your phone reboots into MiniOS, it may not be easy to select the "Normal Boot" option. It took several tries for me. If the phone restarts without prompting you, that is probably just because you were holding down the power button, and the phone will just boot back into MiniOS. When it recognizes the selection properly, it should pop up a menu where you tap "OK" to proceed. If you don't get that right away then keep trying.

bg4m3r, feel free to incorporate any of this info into the OP. I'm not criticizing, just trying to help! After going through this process a few times I was also thinking about starting a thread like this to consolidate the info. Kudos for beating me to it.
 
#21 spocko, Jan 6, 2015 Last edited: Jan 7, 2015
Whenever I try to start the LG Flash Tool it pops up an error saying, "LG USB/Parallel Lock Key is not detected!!!" and then asks for a country, id, and password. What exactly am I doing wrong, here?

Edit: Nvm, I was typing this as another person solved it for me.
 
#22 sagethesagesage, Jan 6, 2015
OK, just followed everything in this post as well. Replaced the MegaLock.dll, which I did earlier but gave it another shot, checked all the MD5 values, everything is good as far as that goes. Still getting the same error, % bar on the Download Mode screen doesn't move, nothing happens at all. SS of LG Flash Tool attached.
 
#23 AndroidEJ7, Jan 6, 2015
Hmm, don't know what the problem could be. The % bar on the phone screen should move while the download is in progress (it does not move at the same rate as the progress bar in the LG Flash Tool).

The only thing I can think of is some kind of driver issue. You could try another computer if you have one available. If not, try removing all phone drivers from your computer, including LG, Samsung, HTC etc. Reboot afterward. Then reinstall the LG driver and try again. Good luck.

Not sure if the Windows version matters, but I ran it on an old laptop with Vista 32-bit.
 
#24 spocko, Jan 6, 2015
Yeah, I've been up all night and tried just about everything except another computer, and nothing has worked. Guess I will have to wait till there's a little more info posted in here. Thanks for all your help, though!

Also just realized you mentioned a progress bar in the Flash Tool...I didn't even see anything like that. I see "Waiting for connection" for a few mins then the error message I posted above. What a headache lol!
 
#25 AndroidEJ7, Jan 6, 2015
What exactly is your issue here?
 
#655 bg4m3r, May 24, 2015