If you're on 3.55, get a USB stick... then right click on it and format to fat32. You'll then want to create a folder on the USB stick called 'PS3', when you have created that folder, open it, and create another folder in the PS3 folder called 'UPDATE'.
Once that's done, download this
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When you have that downloaded, drag that into the 'UPDATE' folder. Now rename the file you just dragged to 'PS3UPDAT.PUP' not updatE, updat.PUP. Then you can right click and safely remove the USB stick.
Now, go to the PS3, remove the game disk from the PS3, then remove the Ethernet cable or disable internet access.
Now stick the USB stick into the RIGHT usb port, go to system update and choose from USB or whatever the next option is, other that the internet.
You should now be jailbroken. Remember, for the love of God, do not loose electricity or whatever while doing this
Now that it's all done, you'll want to find a tutorial on how to convert CEXtoDEX. I recommend this video, as it helped me a long time ago.
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*** you should ignore 4.65 for now, as it wasn't ready, and will come with bugs and maybe big complications. Just install what I gave you, which is 4.46.1. Also, ignore dog88, you'll get those type of people saying they hate you for asking for help. Have fun. ***