PS3 Demonstration Mode Unlock Code:
In security settings press and hold select + square + L1 and L2
Then enter one of these following codes which is related to your version number
1.5x code: 5202
1.6x code: 7568
1.7x code: 0506
1.8x code: 7712 or 7259
This will only work for that session, and will revert back to Demonstration Mode if you have not updated to another firmware, so have the update handy on a USB Drive to do it quickly.
found this and noticed its not on here