UAE PS3 Jailbreak Services: CAN I DOWNGRADE OR JAILBREAK MY PS3 ?
PS3 Softmod OFW 4.82 to backup PS3, PS2, PSX, PSP games to hard drive - YouTube
How to jailbreak my PS3 and still be able to use my account - Quora
I found a broken, untested backwards compatible PS3 model online which ended up costing me just 11€ and it ended up working! It needs a shell replacement but besides that it works
[OLD] How to Jailbreak Your PS3 on Firmware 4.89 or Lower! - YouTube