Root for Optimus 3D V20x Gingerbread

a method that will root those LG Optimus 3Ds that lost root when they were updated to Gingerbread. Unfortunately, it only works for the V20x firmwares, so if you’re running V21 or later, you may be out of luck for the time being. For those who are on V20x, you simply plug in your phone with charge only and USB Debugging on and run the run.bat file. Because it’s a .bat, that means it’s only compatible with Windows PC at this time. V21 or later version  owners should wait for a little again .

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more information here : http://vulnfactory.org/blog/2012/02/26/rooting-the-lg-thrill-optimus-3d/