VMUser, were you able to fix this issue?
Just in case someone else runs into this issue and finds this thread...
The solution is to reflash all the stock images from fastboot.
IF YOU ARE HAVING THE EXACT SAME ISSUE AS OP, FOLLOW BELOW:
Go to
http://forum.xda-developers.com/showthread.php?t=1090687
Download his nand backup.
Open up the file and pull out all the .img files.
Go into fastboot and enter the following:
fastboot erase system
fastboot erase boot
fastboot erase recovery
fastboot erase userdata
fastboot flash cache cache.img
fastboot flash recovery recovery.img
fastboot flash boot boot.img
fastboot flash system system.img
fastboot reboot
The boot will continue to go directly back to recovery, at this point, do this
Go to
http://forums.androidcentral.com/lg...covery-xionia-clockwork-cwma-v1-2518-6-a.html
and download xionia's recovery.
adb reboot bootloader (to get back into fastboot)
fastboot erase recovery
fastboot flash recovery xionia_cwma_12518.6.img (or whatever you named it)
fastboot reboot
Now you should see the stock recovery do a reset on data/cache and reboot. But this time it will boot up finally to the stock VM ROM. You won't have xionia's recovery, it'll be stock - I don't know why, but that's how it was for me. BUT THIS DOES FIX THE WHOLE ISSUE.
From here, you can flash CWM via fastboot ( you won't have root, so you can't adb shell, but you can still adb reboot bootloader with usb debugging mode on ).
Download the CWM for Optimus V here:
http://www.clockworkmod.com/rommanager
Then once flashed, turn off the phone. Press Home + Vol down + Power till LG logo comes on then off, then release all buttons to get into CWM. Then you can flash any ROM you want w/o problems.
Took me like 6 hours to figure this out, as this issue that VMUser as well as I was having didn't seem common. You might be able to replace the stock recovery.img with xionia's on first step, I don't know - didn't try.