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All you have to do to go back to the official firmware is download the official firmware of the version you're on or higher and update over the CFW.

Tutorial:
1) Download the official firmware you want for starters.

2)If the firmware isn't already called PS3UPDAT.PUP rename it to that.

3) On the USB drive you'll be using on the root of the usb( Not already in any folders) create a folder PS3.

4) In the PS3 folder on usb create a folder UPDATE.

5) Copy the PS3UPDAT.PUP file into the update folder.

6) Put your usb into PS3 then go to system update -> update via storage media, then just install it and your back on official firmware!

The reason I posted this is that I get HEAPS of private messages about this and other stuff about CFW and all that.. I have about 50 just about this so yeah...

You cannot downgrade from using this, for example you can't go from a 3.55 CFW and install a 3.41 official firmware

No idea what you meant by that but I hope this guide helped you.

Nvm - - --

Yes to both questions.

Thank you! now i'm sure that i update to the CFW. I was a little bit scared because i was not sure how to update to the ORIGINAL firmware! rep+ for you

what if we went to the 3.55 CFW then down to the 3.41 CFW??

This method is the same way I got CFW.

So would it be a smart idea to revert back to OFW before installing a new CFW to avoid bricking or bugs?

wow i needed this i never new how to do that

You're welcome.