Instructions
Turn on your PS3 console and scroll over to the Settings icon located on the far-left of the main menu screen.
Scroll down and select "System Settings." Click on "System Information." On the next screen, note your system software version. You will need to know which version you are using before you can unlock Normal mode.
Press the "O" button twice on your controller, returning to the "Settings" menu.
Scroll down to the "Security Settings" option and make sure it is highlighted.
Press "L1," "R1," "Select," and "Square" buttons simultaneously and hold them until a message appears asking for a four-digit code.
Enter the four -digit code based on the software version you found in Step 2.
1.5x = 5202
1.6x = 7568
1.7x = 0506
1.8x = 7712 or 7259
1.9x = 2737
2.01 = 0219
2.10 = 2464
2.20 = 4801
2.30 = 6558
2.41 = 9015
2.42 = 9015
2.50 = 6258
2.60 = 8783
2.70 = 7164
2.80 = 7897
3.00 = 2310
3.01 = 2310
3.10 = 5081
3.15 = 5081
3.21 = 7818
3.30 = 3512
3.40 = 2998
3.41 = 2998
3.50 = 2297
3.55 = 2297
3.56 = 2297
3.60 = 1739
Press "X" to confirm the code. You should now be able to use your PS3 console in Normal mode.