Not sure how LG handles the updates, but coming from the Samsung Moment, the over the air updates will pop-up and ask you to update and warn you that you will lose all data on the phone but anything synced to google (contacts and paid apps for example) will re-sync. The annoying thing about the OTA updates with the Moment was it would ask you to update every hour if you didn't update. It still asked you when you were on a custom ROM. The thing is, with the custom recovery in place, the OTA update was unable to install, but would think it did and stop asking you to update - keeping you on the current android system you had prior to the update. So I would assume the Optimus' update will work similarly.