As soon as you boot up your PlayStation 3 while connected on the PlayStation Network, a new update will be pushed through your console.
Version 3.55 adds nothing except for a security patch. What does this mean? It basically blocks the ability to downgrade the firmware that can lead to a jailbreak. This is a good move to combat piracy on the PlayStation 3!
Sorry guys, the new update contains no new features to get everyone excited.PS3 3.55 Firmware Now Available,