Crack Mac OS X Administrator password - create new admin account

Here is how you can create yourself an admin account without knowing the actual administrator password on Mac OS X.

You will need to restart your computer in something we call «single user mode» wich give you a root access to your computer (command line only). You can to that by holding CMD+S keys while rebooting. The screen should turn black and geek stuff appear on the screen. When it's finish loading, enter these command :

/sbin/mount -uw /
rm /var/db/.applesetupdone
reboot

than you'll get the wizard that you've seen when you boot the first time after Mac OS X installation. Follow all the steps including creation of an Administrator account.
basically this crack remove the file that tells Mac OS X you've already done the installation and let you create a new administrator account.

Crack Mac Os X Open Firmware Password - Enable boot options & keyboard shortcuts

If the booting options(like Single User Mode) and keyboard shortcuts of your computer are disabled or locked by a password, this is probably caused by the firmware protection of Mac Os X. One good way to know that this is the firmware protection, is to hold the ALT key while rebooting. If you see a box asking for a password, this is the openfirmware protection. This is usefull if your system only boot on Windows XP and you want to change booting disk (with ALT key). Here is the solution to reset that password.

To crack the firmware protection:
Change the amount of RAM memory in your computer (remove or add DIMMs)
then you reboot the computer while holding CMD+OPT+P+R. Hold the keys until it restart and you hear the apple song. Release them then hold it again. Wait for restart and release then hold it again (basically you need to do it 3 times).