Go to settings>phone>update on the computer you did your NoDo update. There, you will see a "backup" prior to updating your phone. That back, when you phone is connected (make sure of this) will restore 7004 to your phone. Make sure you save everything on your phone before doing this, as you WILL loose everything acquired/synced/changed on your phone after NoDo update...
LG Optimus 7 E900h [NoDo-Unlocked] <3
Nexus One </3