Solution!

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As many have stated, pushing the v21E_00.kdz via the KDZ_FW_UPD program does work. It's just touchy.

This is a step by step guide to get you back in to working shape.

Note: You MUST do this via a PC running Windows XP. Running Vista/7 in compatibility mode is not going to work, period.

Edit: As an alternative, a virtual environment running XP will do the job. Those steps are up to you.

Part 1: Download the files you will need below.

V21E_00.kdz
KDZ_FW_UPD_EN
One-Click-G2x-recovery-flasher-06-16.rar
LG USB Drivers G2x

Part 2:

1) Install the LG G2x USB drivers to your WinXP machine.
2) Extract the entire contents of the One-Click recovery in to a folder and keep it handy.
3) Remove the battery from the phone. Hold both volume buttons and plug in the USB cable. If you are asked for a driver, look in the APX folder where you extracted the One-Click recovery archive.
4) Run OneClickRecoveryFlasher.exe and flash the stock recovery. Wait for the process to finish and close all windows and unplug the phone.
Edit: It's been reported that some users have been able to boot in to their old rom after this point. If you can, you're done. Go
back and put CWR on and flash whatever you want. If you are still stuck, continue this guide.
5) Put the battery back into the phone and turn it on. You will be back at the S/W Upgrade screen. This is where you want to be! Now plug the USB cable back in to the phone. If everything is up to snuff you should have no driver problems at this point.
6) Extract KDZ_FW_UPD_EN.7z in to a folder. Inside is a msxml.msi. You need to run and install this first!
7) Run KDZ_FW_UPD.exe.. Leave the type set to CDMA and the phone mode set to DIAG. DO NOT CLICK ON "Read phone information"
8) Click the folder icon and load the V21E_00.kdz
9) Click launch software update (and pray!)

What you will see:

The log window will immediatly show:
22:41:02 : Launching SW update
22:41:02 : Unpacking KDZ

Then it will stop for a while.
After this you will most likely see:
22:41:16 : KDZ file extraced
22:41:21 : Files were extracted.
22:41:21 : LGMobileDL Load.
22:41:21 : Port = 5
22:41:21 : Connecting to phone
22:41:33 : Check Phone mode = 1

It will pause again before you see:
22:42:08 : Phone type check.......
22:42:08 : LGMobileDL.DLL Loading....
22:42:08 : _SetAuthMark Fail
22:42:08 : AuthMark°¡ Á¤È®È÷ Phone¿¡ Write µÇÁö ¾Ê¾Ò½À´Ï´Ù!
22:42:08 : _SetAuthMark Fail
22:42:08 : LoadCDMAPhoneData() Error
22:42:08 : _DetachDLL Call
22:42:08 : _DetachDLL Call End
22:42:08 : Param : Path = C:\Documents and Settings\All Users\Application Data\LGMOBILEAX\Phone\V21E.wdb
22:42:08 : Param : moduleDir =
22:42:08 : Param : waitTime = 33000
22:42:08 : Param : UsbHighSpeed = 0
22:42:08 : Param : PhoneMode = 1
22:42:08 : Param : BinVersion = V21E_00
22:42:08 : Param : AuthMark = 0
22:42:08 : Call fn_StartUpgrade

Finally after another pause you should start to get spammed by the following message:
22:42:41 : CDMA: wParam = 2007, lParam = 0
22:42:41 : Model Dll Msg Not Found(2007, 0)

You will even hear the USB disconnect/reconnect sound several times.
The sound and spam will continue until the lParam counts to 100.
It should look like:
22:46:25 : CDMA: wParam = 2005, lParam = 100
22:46:25 : Model Dll Msg Not Found(2005, 100)
22:46:25 : CDMA: wParam = 2001, lParam = 0
22:46:25 : Model Dll Msg Not Found(2001, 0)

After it gets to 100, your phone will reboot to the LG logo before going
blank. After a few moments of the blank screen you will get the TMO G2x splash before being dropped back in to your working phone.

Be patient as this takes a while. If at any point the program freezes for more than a few moments, it's most likely going to fail and you will need to try again.

Hope this helps. =)

Thanks to everyone who helped figure this out.

Edit: Added some missing info.

How to unbrick your G2x from GB update through LG

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Mod Please please sticky!!!
All credit goes to jriv


1. use windows xp
1. I SAID USE WINDOWS XP - will not work under any other windows OS
2. download lg drivers for g2x (not 100% sure if needed but I did to be safe
3. download http://csmg.lgmobile.com:9002/swdata...00/V21E_00.kdz
4. download the program in this thread http://forum.xda-developers.com/showthread.php?t=810271
5. unzip kdz
6. run msxml.msi
7. run kdz
8. leave as CDMA & DIAG
9. select the V21E_00.kdz file you downloaded in step 3
10. click launch software update
11. enjoy GB
a few users had to try a few times, it worked on try #1 for me in XP... vista/7 all failed when I tried



http://forum.xda-developers.com/show....php?t=1179750

+1........

Sent from a guy living in a van down by the river

Originally Posted by Spunix

Mod Please please sticky!!!
All credit goes to jriv


1. use windows xp
1. I SAID USE WINDOWS XP - will not work under any other windows OS
2. download lg drivers for g2x (not 100% sure if needed but I did to be safe
3. download http://csmg.lgmobile.com:9002/swdata...00/V21E_00.kdz
4. download the program in this thread http://forum.xda-developers.com/showthread.php?t=810271
5. unzip kdz
6. run msxml.msi
7. run kdz
8. leave as CDMA & DIAG
9. select the V21E_00.kdz file you downloaded in step 3
10. click launch software update
11. enjoy GB
a few users had to try a few times, it worked on try #1 for me in XP... vista/7 all failed when I tried



http://forum.xda-developers.com/show....php?t=1179750

Will either 32bit or 64bit XP work?

U can use win 7 just get a program called XP mode its a virtual win XP

Sent from a guy living in a van down by the river

XP mode didnt work for me...device disconnects during upgrade and xo mode maes you reattach usb devices...which hangs the upgrade softwa

Ahh the links for V21E_00.kdz are all dead..on ALL of the forums

Step 3 not wprking for me. Wont even turn on while holding volume butons then install usb. Where do we get the drivers and what ones do we need? Do we install them on the phone or cumputer? How do we do this? When on click on the link for step 3 to dpwnload it brings up page saying not found. When I go to the xda page for step for to download it brings up a bar code type deal. This makes no sence. Step 5 through 10 I have pretty much done but everytime I press update software it either freezes the window or blanks the window. Or says it cant read my phone. Nor does my computer read my phone anymore. And when it does it mentions something about how the device in the usb port has manfunctioned.

Sorry for all the weird and noob questions. But the truth is the only reason I even attempted this update was b/c it was 4 easy steps which I followed to a T according to LG's website. I even read through then twice just to make sure. I am not a cumputer guy so if someone can help me out with this in simple terms that would be great. I am highly irrated at this situation that the manufacture would release a update and it fail for so many people. Now I have a awesome phone stuck on S/W screen

Originally Posted by jmh625

Step 3 not wprking for me. Wont even turn on while holding volume butons then install usb. Where do we get the drivers and what ones do we need? Do we install them on the phone or cumputer? How do we do this? When on click on the link for step 3 to dpwnload it brings up page saying not found. When I go to the xda page for step for to download it brings up a bar code type deal. This makes no sence. Step 5 through 10 I have pretty much done but everytime I press update software it either freezes the window or blanks the window. Or says it cant read my phone. Nor does my computer read my phone anymore. And when it does it mentions something about how the device in the usb port has manfunctioned.

Sorry for all the weird and noob questions. But the truth is the only reason I even attempted this update was b/c it was 4 easy steps which I followed to a T according to LG's website. I even read through then twice just to make sure. I am not a cumputer guy so if someone can help me out with this in simple terms that would be great. I am highly irrated at this situation that the manufacture would release a update and it fail for so many people. Now I have a awesome phone stuck on S/W screen

If your phone is stock and not rooted (or you haven't flashed an alternate recovery) step 3 can be skipped. Drivers are to be installed to the PC and make sure you scroll down to the T-mobile portion in the linked page. Just download this: http://s3.amazonaws.com/lgforum.com/...zip?1298055768 and this: http://s3.amazonaws.com/lgforum.com/...zip?1303408893

Unzip both and install to PC.

Just a note: It took me at least 3 attempts to get this going. Kept freezing at something (not exact) like: Model Dll Msg Not Found(3501, 1)

I'll try to get a mirror up for the .kdz file soon.

I know it says it won't work on Win7, but the upgrade doesn't fail... The program just stops responding and pretty much force closes. Is that what you meant by won't work on Win7?