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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

Thanks. I haven't CFW yet, but I'm gonna do it if the signed FTP server will be released. But thanks, if I want back to official firmware in the future, I'll use this

xo if i have the kakaroto 3.55 ver 1.2 i can return to the original 3.55 fw using this steps?
thnx for the post!!

another great tutorial! THANKS!!

Yeah, thats the whole point of this thread.

works fine via usb only. good stuff.

wow, im not completely surprised at the fact that most noobs dont yet know how to roll back to OFW or even update FW at all using the usb. I give Broseidon props for this.. I wouldnt have the patience to deal with the answers. Most of them are very quick to install it and dont know enough about it.

Pretty sure this has been posted. But I knew it anyway.

Thanks if it hasn't but I was told by someone here not sure if they posted a thread.

Definately been posted before.

Thanks.......... I hope i dont need to use the official