Support can't root! E:signature verification failed

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http://androidforums.com – Have tried several different methods to root my lg optimus 2x running gingerbread 2.3.4 with no success. Superoneclick hangs at device waiting, z4root force closes and gingerbreak never stops. So I came across a different way and that is by downloading upd_zip.1, moving it to root of sd card, powering up in recovery mode then applying update from sd card and installing the file. Everything seemed to be going smoothly until I got this error message:E: signature verification failed. I rebooted, renamed file and even wiped my card and redownloaded. Still not installing! Does anyone know how to (General)