Removing 3.30 OE-A for Official 1.5

How do I get 3.30 OE-A back to official Sony 1.5 firmware? I want to remove my current Custom firmware back for the most recent official one as I no longer use my custom firmware's addons, such that they are.

Please give me step-by-step instructions, easy to follow. And do not recommend Pandora's Battery. I am not going through that crap again considering no one has a decent walkthrough on it, including how to revert the mem stick and battery back to normal.

I don't understand why you would ant to do this. The custom features aren't hurting anything... Just don't use them.

I believe you can go directly from custom to official through network update, however I do now understand why you want to do that. If you need it for the latest games/demos, then just update to the latest custom firmware (link with intructions in sig ;) ). You are not loosing anything going that way, as DimensionT explained.