PS3: Official Rebug 4.81-REX/D-REX with COBRA 7.31 released - Hackinformer
The PS3™ Guides: Updating Your PS3 - YouTube
Jailbreak PS3 3.56 Firmware Found By Custom Firmware Genius [Download]
PS3 Received a New Firmware Update, By the Way | Push Square
Sony Pulls Down 2.40 PS3 Firmware | WIRED
PS3 Firmware 4.88 released, do not update just yet - Wololo.net
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