According to the first post
, he says to do it in Recovery Mode. Here is what you need to do in order to out you PS3 into Recovery Mode:
Step 1: Turn off your PlayStation 3.
Step 2: Hold the power button down. The system will turn on and turn off once again.
Step 3: Once the system has been shutdown, re-press you finger until you hear 2 consecutive beeps
Step 4: When you hear the 2 beeps take finger off power button.
Step 5: You will be prompted to plug in your controller via usb and then hit the PS button
Step 6: The Recovery Menu will pop up.