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Surprise PS3 update shocks fans - but it probably shouldn't | GamesRadar+
The PS3™ Guides: Updating Your PS3 - YouTube
PS3™ | System Update
PS3 Update to System Software 4.89: Here's a Full Guide for You
Do not update your PS3, latest firmware bricking systems – Destructoid
How to Jailbreak a PS3 (with Pictures) - wikiHow
PS3 - Chapter I - PS3 Downgrade General Information | PSX-Place
If I have a Dex jailbroken PS3 on 4.84, can I still get online even though the latest version is 4. 84? If not, how do I update it without ruining the jailbreak? - Quora
Sony PlayStation 3 Firmware 4.90 Download | TechSpot
PS3 Firmware Update 4.87 Is Out, Here Are The Details