Hi,
I reverted to V9 without a problem. I rooted via Z4root without a problem. However, when I use adb shell, I don't get the # to flash the custom recovery. So I tried rooting my rooted Optimus via adb instructions, and still don't get the # in the adb shell. I was able to verify root access by changing the pixel density to 140, and running SetCPU.
Since I couldn't flash the recovery from my rooted ZV9, I updated to VC and tried to root via adb (using the sd card path). However, the root would not take, and I never got the # in the adb shell.
Finally, I am back on ZVD without root. Now, when I try to force ZV9, my Samsung updater keeps getting a fatal error and has to close.
I suppose the custom recovery module is an absolute must?