[LG Nitro HD] dnorthington:
***Warning, this will void your phone's warranty, may make it a brick, could make your kitten cry, etc... I am not responsible if anything goes wrong.***

I put this together for a friend and thought I would share on XDA. I am not a developer or expert by any means. If you have any issues with what you find here, please comment and I (or others) will try to help. I will update this as we go depending on everyone's experience. You may not need all sections, but use the one's you want.

This if for the p930 model only. I am not familiar with ways to do this on other models.

Read EVERYTHING and make sure you follow the directions.

Rooting the phone (which is required to do everything nefarious/fun with your phone):

Download the super one click program to your computer (home one) to root the phone. It will probably be blocked at work. http://depositfiles.com/files/n0dcxce3t

Download and install the LG drivers on your computer. http://s3.amazonaws.com/lgforum.com/resources/assets/680/original/LGP930.zip?1322664514

If installing SuperOneClick on Windows XP, make sure the .NET Framework v2.0 or above is installed. Windows Vista or 7 is fine.

Enable USB Debugging mode on your Android: Tap Menu > Settings > Applications > Development. Then enable USB debugging.

Verify that your SD card is not mounted: Tap Menu > SD Card & Phone Storage, and tap Unmount SD Card.

Allow install from Unknown Sources: Tap Menu > Security > check Unknown Sources.

Once downloaded, unzip the folder and run SuperOneClick.exe.

Then plug your Android into the computer via the USB cable that came with the phone.

Finally, click the Root button on SuperOneClick. Let it do its thing. If it doesn’t work, try it again. Might take a couple of tries.

Installing the Clockwork Mod Recovery Program (which lets you load the ICS ROM/software/backup/restore/other cool things):

Go to the Market/Play Store on the phone and download/install “ROM Manager” (just the free version is fine).

Open the app and choose “Flash Clockwork Mod Recovery”

Choose your device type “ATT Nitro HD/p930” and let it happen.

Downloading the ICS Software/ROM and Google Apps Zip File:

Then, in the phone’s browser, go to http://get.cm/?device=p930 and download the latest “nightly” file to the SD card. Just click on the blue link and it should start automatically.

Download this file (it’s the Google apps for the phone) http://goo.im/gapps/gapps-ics-20120317-signed.zip

Let both finish downloading.

Installing the ICS software/ROM and Google apps zip:

Open ROM Manager and choose Reboot Into Recovery. Your phone will restart to recovery mode. You use volume up/down to navigate and power to select options.

Choose “Backup and Restore” then “Backup” This will make a complete backup of your phone in case something ever goes wrong. You can use the restore option to restore it.

After the backup is complete, “choose wipe data/factory reset” then “Yes – Delete all user data” (This will wipe the phone).

Then choose install zip from sdcard > choose zip form sd card > Download/

Select the “update – cm 9 file, then choose the “Yes” option again.

Repeat 4 and 5 except choose the gapps file instead of the update – cm9 file in step 5.

Choose “reboot system now” wait for it to boot and you have ICS…

Walk through the steps to set up the phone and enjoy.

Getting updates:

Check back at http://get.cm/?device=p930 for new updates.

Download the new file and install it following steps 1-5 and 7 (you don’t need to reinstall the gapps again or wipe cache/dalvik unless directed to).

You can also get ROM Manager Premium and choose “Check for ROM Updates” vs. downloading.

Optional Stuff:

You can use titanium backup to backup your apps.

Don't restore system apps and restoring missing apps in general can cause problems. It's best to let the market reinstall or manually do it.