You need to be a jailbroken user using multiMAN or some other form of this kind.
You must be on 3.55 OFW in order to install a jailbreak. If your on 3.56+ then your out of luck. You can use a hardware flasher, but your base firmware has to be 3.55 or lower. Anywho, your ps3 has to be a 2k model or under. 3k models and over are not compatible.