There are the Quattrimus JB (CM10, AOKP41) Custom Roms that supported for LG “iproj” family:
Kernel:
Quattrimus JB Custom Rom Download for CM10:
Quattrimus JB Custom Rom Download for AOKP4:
Install instructions
NOTE: This was originally posted on XDA and I figured I’d repost it here (this means that I AM NOT THE DEVELOPER OF THIS ROM). Have a good day and enjoy the ice cream sandwich.
LG Optimus LTE Phone Photos – LG Cell Phone Pictures

Hello, to share my lucky find and success I am sharing the Android 4.0 Ice Cream Sandwich V20c CWM-flashable rom for LG Nitro HD.
How to install the Android 4.0 Ice Cream Sandwich V20c CWM-flashable rom:
I am not responsible for any bricked devices; do not use if you have doubt, if you don’t know how to revert to stock, if you have problems, if you trip over your own feet, get your girl pregnant, or suffer from mental distress, IT IS NOT MY FAULT, IT’S YOUR FAULT.
LG Nitro HD Phone Photos - LG Cell Phone Pictures

The LG Nitro HD (AT&T’s version of the LG Optimus LTE) is one of the few devices in LG’s Optimus line that hasn’t been updated to Android 4.0, also known as Ice Cream Sandwich. The day has finally come though, as AT&T and LG are now offering the update for the phone. It’s not as easy as an OTA (over-the-air) update, but anyone truly interested in getting ICS on their device should have no trouble updating.
LG Nitro HD Android 4.0.4 ICS V20C Firmware Download
Here you can download the KDZ file follow the download link. The file is about 409MB, and the update should take you about 30 minutes and leave your device info intact though, a back up is suggested.
LG Nitro HD Phone Photos - LG Cell Phone Pictures
