If you're on firmware version 3.55 or below, then you can use Geohot's "Custom Firmware" (His Exploit) Which was released, and legal to use, or a variety of custom firmwares that other people made using his exploit. If you are on firmware 3.55, you can jailbreak your system by using This Guide . If you are on 3.50 or lower firmware, update to 3.55 Firmware then use the guide I showed earlier. If your PS3 is on 3.56 (Or Newer) firmware, it is not possible to jailbreak your PS3. Jailbroken PS3s cannot connect to PSN, but if you decide that you want to un-jailbreak it, you can use the built in "System Update" feature, which will update to the newest version, remove the jailbreak, and allow you to play online. However, once you update, there is no way to go back, and jailbreak again.