Now just to make sure, you have an Optimus M MS690 and NOT the Optimus M+ MS695 right?
Go here --->
http://androidforums.com/optimus-m-...pdated-1-20-12-ics-mint-theme-pbot-added.html
Follow the instructions carefully, and be sure to do a FULL data wipe before flashing this ROM!! No need to download Gapps, they are already on there.
Since you didn't make a Nand backup, this is the closest thing to stock that you can get without having to use the unbrick guide and re-flash the stock firmware using a KDZ flash tool, plus this way is easier and it's debloated. This ROM runs great on my Optimus...