You should buy and E3-Flasher, if you wana mod, it's safer to use an E3 flasher, You can use it to mod, and to downgrade your frimware anytime you want. With the 3.55 PS3 if you accidentally update, you can't go back. If you don't mess up the installation of the E3-Flasher, it will last longer and be a better investment. It's also cheaper