I know its late but its better than never. Guys having LG Optimus 2X may now update their Device to Android 4.0 Ice cream Sandwich. According to reports from XDA, the Android 4.0.4-based v30a firmware is now available to download via LG’s PC update utility. The V30 firmware version is also known as the Android 4.0 Ice Cream Sandwich ROM for the Optimus 2X.
So for full instructions you need to head over to XDA.