Go into recovery mode, 2 ways:
1: The easy way:
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 promted to plug in your controller via usb and then hit the PS button
Step 6:
The Recovery Menu will pop up.
2: The more complicated way:
Remove ur ps3's hdd and format it using a pc/laptop, then connect it to ur ps3 again and point the CFW in any usb storage device to the ps3 and ti will be installed.