PS3: Official Rebug 4.81-REX/D-REX with COBRA 7.31 released - Hackinformer
W00fer on Twitter: "Hey @esc0rtd3w @Mathieulh @PSXPlace @roXyPS3 I have found something interesting. Today I received a new blu-ray movie which requires a software update of the PS3. I'm on 4.81 Rebug
My brother dropped off our old PS3 collection (left). On the right is my collection since this year. It's a slim model on os version 4.81. Do you think it's worth it
How to update ps3 to 4.81 CFW - YouTube
How To: Jailbreak PS3 Update 4.81 OFW to CFW - PS3 Jailbreak 4.81 [DEX/CEX] - YouTube