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Alright so many of us have decided to try out the new downgrading from 3.55 to 3.41 and have gotten stuck trying to go back to 3.55 with corrupted data, so here is a tut that will show you how to get back to either 3.55 official firmware or 3.55 custom firmware or pretty much any other firmware you want...
Requirements
you will need a dongle that can get you into factory service mode, the lv2diag files [You must login or register to view this content.] and you will also need the 3.55 ofw, 3.55 cfw(if you want to go back to custom firmware), the 3.41 modified pup, and you will need another firmware lower than 3.41(I used 3.15)

Step 1) put ps3 into factory service mode with your jailbreak device, or jig key (doesn't matter what kind even the itouches can work if you know how to do that)
Step 2) turn off PS3...then on the computer, put the lv2diag from FILE1 and the 3.41 modified pup onto the root of a formatted fat32 usb stick.
Step 3) plug the usb stick into the far right usb slot on your ps3 and turn on the ps3, let the ps3 do its thing and it should turn on but not show anything on the screen, then after about no more than 5 minutes it should turn off.
Step 4) On your computer replace the 3.41 modified pup that's on your usb stick with a pup firmware lower than 3.41 and keep the lv2diag from file1 on the usb stick as well.
Step 5) plug the USB stick back into the ps3 and turn it on again, it should do the same thing again as it is downgrading once more to a lower firmware (steps 4 and 5 is required because the modified firmware from 3.41 is actually read on the PS3 as a 3.56 firmware and that is why it does not allow us to go back to 3.55)
Step 6) Once the PS3 turns back off, delete all the files on your USB stick and put the lv2diag from FILE2 onto it(this is the file that allows us to get out of factory service mode)
Step 7) Plug the USB stick that has the lv2diag from FILE2 into the ps3 in the far right usb slot and then turn on the PS3 and let it do its thing and it will turn off again in about 2-3 minutes.
Step After this is all done, update your ps3 to 3.55 fw via usb stick or throught the internet and you should be back to 3.55 official firmware if you want 3.55 cfw, then you must do one more step.
Optional Step 9) After the 3.55 update is finished load the 3.55 cfw onto the USB stick in this directory Z:\PS3\UPDATE (the z is just the name of your usb drive, it can be different on your computer)
step 10) Once the cfw is loaded on the USB stick then just plug it into the ps3 and go to the system update and update via USB
Links
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If there is anything else you need or are confused about anything just feel free to let me know or ask I won't flame

is this really works

Why is this a thread to downgrade from 3.55 to 3.15 then go back to 3.55

WHAT THE HECK IS THE POINT IN DOING THIS?

I second that

I made this tut not for downgrading but mainly for getting back to 3.55 AFTER trying to downgrade 3.55-3.41 because the downgrading really just puts your ps3 to a version that the ps3 thinks is 3.56 and so thats why you need to downgrade to 3.40 or lower in order to update to ofw to 3.55

Would it be possible to modify the 3.41 .PUP to make it so that it says 3.55 and then upgrade from 3.15 to the modified 3.41 so that we might be able to go online? Just a thought. If its not possible. don't flame me. :mudkip:

Lol I'm not sure, it probably is possible but that would require some time..

I'm willing to wait.

to fix the 3.56 error type thing lol just normally downgrade to 3.41 then from 3.41 downgrade to 3.15 then upgrade to 3.41. i know i have a VERY short amount of posts but belive me it works

i am helping anyone who wants to host a challenge using 3.55 CFW. I will help from installing CFW all the way to hosting your very own challenge lobby. Add Brandon Pizzarelli on skype and send me a message on skype saying your from NGU.

You will need a USB flashdrive and a computer that is able to download files