It was suggested I move this post into its own thread so questions could be consolidated. Also there was occasional confusion over the difference between running KP500 from the Unbrick thread and what is described in this post. This post configures KP500 to flash in Diag mode which is the normal way to flash a phone that is working. In particular it is how the LG Mobile Support Tool flashes your phone to VC/VD. KP500 in the Unbrick thread flashes in Emergency mode and is most useful when your phone is no longer responding (bricked).
For archive purposes, this post (and associated q&a) was previously on this thread:
Previous revert to V9 using KP500 post
====
Thanks go out to cordell, DCJoe, kingdavidbaker for suggesting this method and working through the procedures, KSmithInNY for comments making this more readable and of course zefie for his unroot procedure and archive of the firmware cabs.
WARNING: If you received a refurbished LS670 from Sprint as a replacement, you might run into troubles trying to use the LG Mobile Support Tool to update to VC/VD. See this post for details on how to tell if you are affected by this problem. You can still revert to V9 and root. However if your refurbished unit is affected by this problem you will NOT be able to upgrade to the VC/VD using the LG Mobile Support Tool. You will need to force flash VC/VD using KP500. Instructions for how to do force flash VC/VD are in the reference section of this post.
WARNING #2: If you recently received a LS670 from Sprint which came with VC/VD from the factory, then there is a possibility you have a newer hardware revision with different LCD hardware. Since only VC/VD have the drivers for this new LCD hardware, if you revert to V9, your display will be blank. The phone is still functional (as in it boots into android and you can still operate the phone, just with no visual feedback). Don't worry, worse case, just use KP500 to flash back to VC/VD and you'll be back to normal. However if you've come this far, you might as well get root by performing the critical function of manually installing a custom recovery (or the stock V9 recovery) even without the display being functional, after which you can upgrade to a VC/VD-based ROM and get your display back. You can also install Android Screencast to view your screen on your PC. See this post for more details (will be updated as more information becomes available).
High level summary
1) Install the LG Mobile Support Tool and USB Drivers [LG Mobile Support Tool] [LG LS670 USB Drivers]
- the KP500 tool referenced below uses this to write the firmware to your phone
2) Force flash the V9 firmware using the KP500 tool (see below)
3) Root your phone, install Xionia CWMA custom recovery, and update to LS670ZVD. Directions here (Part 2, skip the first step).
If you are an advanced user, you can skip some steps and do the alternate procedure in the reference section.
Details for how to Force Flash V9 using KP500 - (ie summary step #2)
(BACKUP your app data first if you care about it)
(the following assumes you already installed USB drivers for your phone to get adb working)
a) make sure you have at least 600MB free on the drive containing your windows installation, specifically the drive that contains Documents and Settings (or ProgramData on Vista)
b) disable standby, hibernate, and any screensavers
c) make sure your phone is fully charged
d) turn on USB debugging mode on your phone
You should have a folder
g) open a windows command prompt
(make sure you have at least these 5 files, one file is named LS670ZV9.cab and the file size is 99,220,700)
(if your directory does not look like this, STOP here, figure out why)
j) connect your phone using USB cable
k) from your command prompt, run the KP500 program/executable
m) when it asks for model # - LS670
n) when it asks for cab file - LS670ZV9.cab
(double check you entered the correct cab filename, cut/paste if you need to)
o) when it asks for version - LS670ZV9_20
p) you will see "Loading..." and it should bring up the LG Mobile Support Tool in a separate window
Step 1 - Analysis
if you see this error, then you didn't install the LG Mobile Support Tool
if the LG tool gets stuck at 35% checking the phone model, make sure you are booted into Android and not the Recovery partition.
if the LG tool asks you to restart because it can't connect to the phone ("checking connection with phone") unplug/plugin the phone, then press restart and everything should work fine. (per recent reports #1 #2)
if the LG tool won't recognize your phone no matter what you try, try reinstalling the USB drivers from the LG tool (per recent report)
Step 2 - Download
if the tool aborts and you see this error near the end of the log
see if this post or this post applies.
q) Step 3 - Update
After the download step (which in reality is just unpacking the cab file we specified, not actually downloading), your phone screen should switch to a red LG Logo with the text "Download is in progress. Do not disconnect cable."
Let it run, do not touch your phone until complete, it'll take around 15 minutes
r) when the update/flash portion is ALMOST complete the phone will reboot and you'll see Android on your screen, this possibly could behave like a first boot, meaning it'll take a while to build everything from scratch, 3 minutes or less. You'll eventually see the Android startup home screen. This may trick you into thinking the flash is done. Don't be tricked. Regardless of whether the LG Mobile Support Tool is at 100% or not, do not touch the phone yet, it still needs to reload your NVRAM items onto the phone. Do NOT touch the phone until it says Completed
s) Step 4 - Complete
once the LG Mobile Support Tool says completed, you should be at the standard android startup screen, congrats, you now have V9 (possibly with a VC or VD recovery partition, which will become Xiona CWMA custom recovery as part of the LS670ZVD rooting process) If you have no intentions of running VC/VD OS/Radio, then you can stop here and stick with V9. z4root.apk will give you one-click root. However if you ever want to get root with the VC/VD OS/Radio, you should continue with the next steps.
Note: If LG Mobile Support Tools says "completed" but you are stuck on the startup screen that says *Android* for more than 10 minutes, perform this:
Factory reset from stock recovery
t) exit the LG Mobile Support Tool and KP500 (option Q)
u) You MUST have this step (install CWMA or stock V9 recovery) completed if you want to preserve your ability to root. You will NOT have permanent root at the end of this step (because you will lose root when you upgrade to VD). You WILL, however, be set up to have success following the rooting thread instructions. If you don't care about root and just want to run stock V9, you can skip this step completely.
Root your phone, install Xionia CWMA custom recovery, and use LG Mobile Support Tool to install LS670ZVD. Directions here (Part 2, skip the first step). Installing Xionia CWMA custom recovery (or stock V9 recovery, or any custom recovery) will preserve your ability to root after updating to LS670ZVD. Installing LS670ZVD using the LG Mobile Support Tool will get you the latest stock VD Android and VD radio/baseband while keeping your existing CWMA custom recovery. After that you can choose to stick with stock VD Android or update to your favorite VC or VD-based ROM. If you are a more advanced user who doesn't need specific instructions, you can save some steps by jumping to step 2 of the alternate method in the reference section below.
v) re-enable standby, hibernation, and/or screensavers if you need to
Reference:
zefie's archive of v7,v8,v9,vC,vD cab files for Optimus S:
Index of /zefie/files/cell/LGLS670/roms/LGNPST Recovery/cab - Mystic Midnight Files
How-to Unroot thread:
http://forum.androidcentral.com/lg-...45403-how-unroot-your-phone-return-stock.html
LG Ally instructions which inspired this solution here:
How-To: Flash Stock LG Rom on LG Ally
Stock V9 Recovery image
http://files.mysticmidnight.net/zefie/files/cell/LGLS670/roms/V9_LG_Stock_Recovery.zip
LG Mobile Support Tool
LG Mobile Support Tool Application Download
File checksum tool
SlavaSoft FSUM - Fast File Integrity Checker
How to root V9 Optimus S thread
http://forum.androidcentral.com/lg-optimus-s-rooting-roms-hacks/43108-how-root-lg-optimus-s.html
How to root VC Optimus S thread
http://forum.androidcentral.com/lg-...-guide-rooting-software-version-ls670zvc.html
How to root VD Optimus S thread
http://forum.androidcentral.com/lg-...-guide-rooting-software-version-ls670zvd.html
V8->V9 update.zip
update.zip
Get rid of update notification
http://forum.androidcentral.com/lg-...c-vd-using-kp500-diag-mode-17.html#post770088
z4root one-click root that works with V9 Optimus S (won't work with VC Optimus S)
[APP] z4root - xda-developers
Factory reset from within Stock Recovery
Instructions
Flash Image tool
Android Forums
Substitute these steps to Force Flash VD
f) download VD cab (LS670ZVD_12.SD_12.P60675.cab) (Alternate download)
h) ren LS670ZVD_12.SD_12.P60675.cab LS670ZVD.cab
i) expected checksum - 6bd5faf21acb951abb7e2c6e8ce39e7d *LS670ZVD.cab
n) cab file - LS670ZVD.cab
o) version - LS670ZVD_12
Substitute these steps to Force Flash VC
f) download VC cab (LS670ZVC_11.SC_11.P60674.cab) (Alternate download)
h) ren LS670ZVC_11.SC_11.P60674.cab LS670ZVC.cab
i) expected checksum - 579bfcf1dc2309dd71580d246c954d7f *LS670ZVC.cab
n) cab file - LS670ZVC.cab
o) version - LS670ZVC_11
Substitute these steps to Force Flash V8
f) download V8 cab (LS670ZV8_23.S8_23.P60671.cab)
h) ren LS670ZV8_23.S8_23.P60671.cab LS670ZV8.cab
i) expected checksum - cb646c7152cd8e1cdbb2d462534fe89a *LS670ZV8.cab
n) cab file - LS670ZV8.cab
o) version - LS670ZV8_23
Manually flashing Zefie's CWMA Recovery image (requires root)
Zefie's Xionia CWMA Custom Recovery thread
Manually flashing stock V9 Recovery image (requires root)
UNZIP flash_image and stock V9 recovery.img to /sdcard
If this is the first time running "su", you need to have your phone not on the lock screen and acknowledge the prompt asking for root privileges.
Alternate REVERT procedure for *advanced users* (these instructions are written at a summary level so you need to know some basic terminology/techniques):
1) Force Flash V9 using the KP500 tool
2) Root using the rageagainstthecage exploit or z4root
3) Manually flash Zefie's Xionia CWMA custom recovery image (see this thread)
4) After installing Xionia CWMA you should be in CWMA Custom Recovery, choose "reboot system now" to get back into Android
5) Use the LG Mobile Support Tool to update to VD
6) From CWMA recovery, wipe cache, dalvik
7) Install your favorite VC/VD-based custom ROM
For archive purposes, this post (and associated q&a) was previously on this thread:
Previous revert to V9 using KP500 post
====
Thanks go out to cordell, DCJoe, kingdavidbaker for suggesting this method and working through the procedures, KSmithInNY for comments making this more readable and of course zefie for his unroot procedure and archive of the firmware cabs.
WARNING: If you received a refurbished LS670 from Sprint as a replacement, you might run into troubles trying to use the LG Mobile Support Tool to update to VC/VD. See this post for details on how to tell if you are affected by this problem. You can still revert to V9 and root. However if your refurbished unit is affected by this problem you will NOT be able to upgrade to the VC/VD using the LG Mobile Support Tool. You will need to force flash VC/VD using KP500. Instructions for how to do force flash VC/VD are in the reference section of this post.
WARNING #2: If you recently received a LS670 from Sprint which came with VC/VD from the factory, then there is a possibility you have a newer hardware revision with different LCD hardware. Since only VC/VD have the drivers for this new LCD hardware, if you revert to V9, your display will be blank. The phone is still functional (as in it boots into android and you can still operate the phone, just with no visual feedback). Don't worry, worse case, just use KP500 to flash back to VC/VD and you'll be back to normal. However if you've come this far, you might as well get root by performing the critical function of manually installing a custom recovery (or the stock V9 recovery) even without the display being functional, after which you can upgrade to a VC/VD-based ROM and get your display back. You can also install Android Screencast to view your screen on your PC. See this post for more details (will be updated as more information becomes available).
High level summary
1) Install the LG Mobile Support Tool and USB Drivers [LG Mobile Support Tool] [LG LS670 USB Drivers]
- the KP500 tool referenced below uses this to write the firmware to your phone
2) Force flash the V9 firmware using the KP500 tool (see below)
3) Root your phone, install Xionia CWMA custom recovery, and update to LS670ZVD. Directions here (Part 2, skip the first step).
If you are an advanced user, you can skip some steps and do the alternate procedure in the reference section.
Details for how to Force Flash V9 using KP500 - (ie summary step #2)
(BACKUP your app data first if you care about it)
(the following assumes you already installed USB drivers for your phone to get adb working)
a) make sure you have at least 600MB free on the drive containing your windows installation, specifically the drive that contains Documents and Settings (or ProgramData on Vista)
b) disable standby, hibernate, and any screensavers
c) make sure your phone is fully charged
d) turn on USB debugging mode on your phone
e) download the KP500 tool zip file and unzip to your C: drive (attached, windows utility, tested in WinXP, Vista, Win7(XP-compatible mode/disable signed drivers option #1, disable signed drivers option #2))
You should have a folder
f) download the V9 cab file from zefie's archive below (LS670ZV9_20.S9_20.P60671.cab) and place in same folder/directory as (e)
g) open a windows command prompt
h) from command prompt rename LS670ZV9_20.S9_20.P60671.cab as LS670ZV9.cab
The output of the above "dir" command should look like this:
(make sure you have at least these 5 files, one file is named LS670ZV9.cab and the file size is 99,220,700)
(if your directory does not look like this, STOP here, figure out why)
i) OPTIONAL: run a checksum on the V9 cab file to verify file integrity (checksum tool link) Unzip the fsum.zip archive and place fsum.exe in the same folder/directory as (e) From your command prompt type
expected checksum - make sure both the checksum (1st column) and filename (2nd column) match
j) connect your phone using USB cable
k) from your command prompt, run the KP500 program/executable
l) choose option J - Flash with assistant (file .cab)
m) when it asks for model # - LS670
n) when it asks for cab file - LS670ZV9.cab
(double check you entered the correct cab filename, cut/paste if you need to)
o) when it asks for version - LS670ZV9_20
p) you will see "Loading..." and it should bring up the LG Mobile Support Tool in a separate window
Step 1 - Analysis
if you see this error, then you didn't install the LG Mobile Support Tool
if the LG tool gets stuck at 35% checking the phone model, make sure you are booted into Android and not the Recovery partition.
if the LG tool asks you to restart because it can't connect to the phone ("checking connection with phone") unplug/plugin the phone, then press restart and everything should work fine. (per recent reports #1 #2)
if the LG tool won't recognize your phone no matter what you try, try reinstalling the USB drivers from the LG tool (per recent report)
Step 2 - Download
if the tool aborts and you see this error near the end of the log
then you may have renamed the cab file incorrectly, placed it in the wrong folder/directory, or typed the wrong filename in step
see if this post or this post applies.q) Step 3 - Update
After the download step (which in reality is just unpacking the cab file we specified, not actually downloading), your phone screen should switch to a red LG Logo with the text "Download is in progress. Do not disconnect cable."
Let it run, do not touch your phone until complete, it'll take around 15 minutes
r) when the update/flash portion is ALMOST complete the phone will reboot and you'll see Android on your screen, this possibly could behave like a first boot, meaning it'll take a while to build everything from scratch, 3 minutes or less. You'll eventually see the Android startup home screen. This may trick you into thinking the flash is done. Don't be tricked. Regardless of whether the LG Mobile Support Tool is at 100% or not, do not touch the phone yet, it still needs to reload your NVRAM items onto the phone. Do NOT touch the phone until it says Completed
s) Step 4 - Complete
once the LG Mobile Support Tool says completed, you should be at the standard android startup screen, congrats, you now have V9 (possibly with a VC or VD recovery partition, which will become Xiona CWMA custom recovery as part of the LS670ZVD rooting process) If you have no intentions of running VC/VD OS/Radio, then you can stop here and stick with V9. z4root.apk will give you one-click root. However if you ever want to get root with the VC/VD OS/Radio, you should continue with the next steps.
Note: If LG Mobile Support Tools says "completed" but you are stuck on the startup screen that says *Android* for more than 10 minutes, perform this:
Factory reset from stock recovery
t) exit the LG Mobile Support Tool and KP500 (option Q)
u) You MUST have this step (install CWMA or stock V9 recovery) completed if you want to preserve your ability to root. You will NOT have permanent root at the end of this step (because you will lose root when you upgrade to VD). You WILL, however, be set up to have success following the rooting thread instructions. If you don't care about root and just want to run stock V9, you can skip this step completely.
Root your phone, install Xionia CWMA custom recovery, and use LG Mobile Support Tool to install LS670ZVD. Directions here (Part 2, skip the first step). Installing Xionia CWMA custom recovery (or stock V9 recovery, or any custom recovery) will preserve your ability to root after updating to LS670ZVD. Installing LS670ZVD using the LG Mobile Support Tool will get you the latest stock VD Android and VD radio/baseband while keeping your existing CWMA custom recovery. After that you can choose to stick with stock VD Android or update to your favorite VC or VD-based ROM. If you are a more advanced user who doesn't need specific instructions, you can save some steps by jumping to step 2 of the alternate method in the reference section below.
v) re-enable standby, hibernation, and/or screensavers if you need to
Reference:
zefie's archive of v7,v8,v9,vC,vD cab files for Optimus S:
Index of /zefie/files/cell/LGLS670/roms/LGNPST Recovery/cab - Mystic Midnight Files
How-to Unroot thread:
http://forum.androidcentral.com/lg-...45403-how-unroot-your-phone-return-stock.html
LG Ally instructions which inspired this solution here:
How-To: Flash Stock LG Rom on LG Ally
Stock V9 Recovery image
http://files.mysticmidnight.net/zefie/files/cell/LGLS670/roms/V9_LG_Stock_Recovery.zip
LG Mobile Support Tool
LG Mobile Support Tool Application Download
File checksum tool
SlavaSoft FSUM - Fast File Integrity Checker
How to root V9 Optimus S thread
http://forum.androidcentral.com/lg-optimus-s-rooting-roms-hacks/43108-how-root-lg-optimus-s.html
How to root VC Optimus S thread
http://forum.androidcentral.com/lg-...-guide-rooting-software-version-ls670zvc.html
How to root VD Optimus S thread
http://forum.androidcentral.com/lg-...-guide-rooting-software-version-ls670zvd.html
V8->V9 update.zip
update.zip
Get rid of update notification
http://forum.androidcentral.com/lg-...c-vd-using-kp500-diag-mode-17.html#post770088
z4root one-click root that works with V9 Optimus S (won't work with VC Optimus S)
[APP] z4root - xda-developers
Factory reset from within Stock Recovery
Instructions
Flash Image tool
Android Forums
Substitute these steps to Force Flash VD
f) download VD cab (LS670ZVD_12.SD_12.P60675.cab) (Alternate download)
h) ren LS670ZVD_12.SD_12.P60675.cab LS670ZVD.cab
i) expected checksum - 6bd5faf21acb951abb7e2c6e8ce39e7d *LS670ZVD.cab
n) cab file - LS670ZVD.cab
o) version - LS670ZVD_12
Substitute these steps to Force Flash VC
f) download VC cab (LS670ZVC_11.SC_11.P60674.cab) (Alternate download)
h) ren LS670ZVC_11.SC_11.P60674.cab LS670ZVC.cab
i) expected checksum - 579bfcf1dc2309dd71580d246c954d7f *LS670ZVC.cab
n) cab file - LS670ZVC.cab
o) version - LS670ZVC_11
Substitute these steps to Force Flash V8
f) download V8 cab (LS670ZV8_23.S8_23.P60671.cab)
h) ren LS670ZV8_23.S8_23.P60671.cab LS670ZV8.cab
i) expected checksum - cb646c7152cd8e1cdbb2d462534fe89a *LS670ZV8.cab
n) cab file - LS670ZV8.cab
o) version - LS670ZV8_23
Manually flashing Zefie's CWMA Recovery image (requires root)
Zefie's Xionia CWMA Custom Recovery thread
Manually flashing stock V9 Recovery image (requires root)
UNZIP flash_image and stock V9 recovery.img to /sdcard
If this is the first time running "su", you need to have your phone not on the lock screen and acknowledge the prompt asking for root privileges.
Alternate REVERT procedure for *advanced users* (these instructions are written at a summary level so you need to know some basic terminology/techniques):
1) Force Flash V9 using the KP500 tool
2) Root using the rageagainstthecage exploit or z4root
3) Manually flash Zefie's Xionia CWMA custom recovery image (see this thread)
4) After installing Xionia CWMA you should be in CWMA Custom Recovery, choose "reboot system now" to get back into Android
5) Use the LG Mobile Support Tool to update to VD
6) From CWMA recovery, wipe cache, dalvik
7) Install your favorite VC/VD-based custom ROM
Last edited:
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