I have an LG Optimux 2X (P999). When I rooted it there was only a Windows tool to overwrite the sub-boot loader controlled by the Tegra chip. Not sure if there are Linux tools available now. Still, the latest Cyanogenmod version available for it is 7.20, the equivalent of Gingerbread (2.3.7). The battery is on the verge of dying, so I'm looking to replace mine. !Android