Thanks for the extra root option.
I had my LG Optimus SU640 (same as Nitro HD) rooted and running 2.3.5, and just updated firmware to Android v4.0.4 today on the LG website. I'm in Korea.
I have tried everything under the sun to root my updated OS but i'm not getting anywhere.
Is it not possible to root this phone with the updated Android 4.0.4 OS at the moment?