Ok. First thing is to make sure you have the LG USB drivers installed on your computer. Use these:
http://www.lg-phones.org/wp-content/uploads/LG-Optimus-V.zip phone should be unpluged. After initial install, reboot computer to allow the other two drivers to be installed ( there are five in all). After reboot, plug in phone with it in recovery mode. Wait for drivers to finish installing.
Next get the Java 6 jdk from here:
http://www.oracle.com/technetwork/java/javase/downloads/jdk6u38-downloads-1877406.html. If you have 32 bit Windows OS then select the x86. Once installed you will need to set the path and class path to the java.exe
Go to start/control panel/system/advanced/environmental variables.
There is a window with different variables that you can select. Scroll up till you find the class path and select it. Now choose the edit option. You will see the class path to the older java.exe. Delete it and put in it's place the class path to the new java.exe
Example, my class path shows:
"C:\Program Files\Java\jdk.1.6.0_33\bin" (the bin is where the Java.exe is found)
Make sure you have a " before and after. Select ok.
Now scroll down and find the path. Select it and choose edit. Don't delete anything from here. Just put in the path to the java.exe.
Example, mine is:
;C:\Program Files\Java\jdk.1.6.0_33\bin (no " on either end, but instead a ; before the C which seperates the paths). Select ok. Then ok. Go back to home screen.
Now go here:
http://www.support-4-you.com/main/i...d-adb-installation&catid=40:how-tos&Itemid=57 follow the instructions. We need to make sure the path to the adb.exe is set properly so go back to environmental variables and manually enter the path. Example, my path is:
;C\SDK\platform-tools (this is where the adb.exe is).
Next we will download and install QTADB found here:
http://androidforums.com/optimus-v-all-things-root/517758-playing-qtadb.html#post4093175 put it in your C drive where you put the SDK. Open the folder. Open the next folder. Right click on the Android Guy and select to make a shortcut. Move it to the desktop/home screen.
Whew! Now where finally ready.
Plug phone into computer and left click the QtADB short cut. It will first ask you to select the path to the adb.exe, when done If everything was set up properly you should see files from your computer on the left side and files from the phone on the right. In the small window on right side click on the drop down button. Select /system.
Go to /system/bin and scroll down to find su. If there great! If not go to /system/xbin and check there. If yes, you still might have a good root. Check what the permissions are. It should be rwsr-sr-x if in bin location or rwxr-xr-x if in xbin location.
If not your root is messed up or missing.
If you can't get QtADB to show anything but the SD card on the right side or root is messed up or missing then we will need to use sammyz's KDZ Unbrick guide.
If you have a good Root we can process further.
Let us know how it goes.
Sent from my LG-VM670 using Android Central Forums
EDIT: If you can't see anything in the right side of QtADB then go to the recovery menu on the phone. Select "mounts and storage". Select "mount system"
If nothing shows or su is not right then we will need to put a stock system on the phone using the KDZ.