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PSN : The_Dog_Pounder

idk if your Cex or Dex but you can find cfw anywhere on google or youtube.

Pretty much all Firmware every made for the PS3 is found here: You must login or register to view this content.
If you're on CFW, use a 3.55 CFW update then update to 4.81 Firmware
If you're on OFW, you'll need to downgrade your firmware via hardware flasher (if downgradeable) then update it with CFW or buy a 3.55 OFW system.

You can't jailbreak 4.81 OFW.

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It's not as simple as a download link..

If you are sitting on any official sony firmware, higher than 3.55, you must use a physical hardware flasher tool, such as e3 flasher, teensy, or progskeet, to flash your ps3 memory and downgrade to 3.55, which is from where we can install a cfw..