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Update data download procedure
Create a folder on the storage media in which to save the update data. Using a PC, create a folder named “PS3” on the storage media or USB device. Within the PS3 folder, create a folder named “UPDATE”.
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Download the update data and save it in the "UPDATE" folder created in step 1.
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Notice:
Be sure to save the update data as noted below. If the data is not saved in the correct way, the PS3™ system will not recognize the update data. The folder name must be in all uppercase letters.
Location: Save in the “PS3” folder > “UPDATE” folder
File name: Save as file name “PS3UPDAT.PUP”. Update procedureNotice
Direct Link to 3.00

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Update procedure

Do not turn off the PS3™ system or remove the storage media or USB device during an update. If an update is cancelled before completion, the system software may become damaged, and the system may require servicing or exchange.
During an update, the power button on the system front and PS button of the controller are inactive.
Insert the storage media or USB device that contains the update data in the PS3™ system.
From the home menu, select (Settings) > (System Update), and then press the button.

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Select [Update via Storage Media], and then press the button.

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The system automatically searches for and finds the update data saved on the storage media or USB device.
Start the update.
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Press the button to start the update. Follow the on-screen instructions to complete the update.
Confirm that the update was successful. After the update has been completed, go to (Settings) > (System Settings) > [System Information].
If the [System Software] field displays the version number of the update, the update was successful.
Hint
You can delete the update data from the storage media or USB device after the update has been successfully completed
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thank if this helped you!

It's just like the Psp, you can't update an old update to the newest update

yes you can use it to hack modern warfare 2

---------- Post added at 07:20 PM ---------- Previous post was at 07:18 PM ----------

you can after the new update sony is giving us after E3 then you can use update via storage media

Wait so to clarify for all the rest, does this or does it not work?

this worked for me! but i had 3.15 not 3.30

So if I use this method I can downgrade my 3.30 60GB Fat PS3 to 3.00 firmware?

No because this is the same method as updating except you are "updating" to an older firmware which is not possible.

I degrade my PS3 by saying "you're a piece of shit." I also say... "I hate you." Those sorts of things. :p

lol I was thinking the exact same thing...except.............you had the guts to say it. I admire you.

So, Your saying MW2 is hacked due to this? MW2 is hacked to Hunter12 Deycryping the patch you download to update the GAME, Not the PS3 :L