Okay guys, I've seen many people having trouble with CFWs, trying to "uninstall" CFWs, basicaly trying to bring the PS3 to a legit version of firmware.
This tutorial is for you if:
You are stuck in Demonstration Mode Version 4.53
You are trying to get rid of jailbroken firmware and you are afraid of hitting the Demonstration Mode
And here we go:
Step 1: On a flash drive (USB Device) create a folder named PS3 (!respect the caps on both folders!)
Step 2: In the folder called "PS3" create a folder named UPDATE
Step 3: Download and extract the PS3UPDAT.PUP and place it into the UPDATE folder on the flash drive