Hi guys, this is the first time doing a thread.. I'm a big fan of the site and I thought in sharing a way I found in how to solve the issue.
Well for some of us we downgraded to 3.41 in order to use the ps3 hacks and now some of us want to update to 3.55 cfw and it has become a real problem because every time you tried to update to every single new update even 3.56 and we kept getting the corrupted data error and stops the update.
So I found a way to fix it:
1. You have to get your ps3 into factory settings just like when you downgraded
2. Now just like you did for downgrading you do it for update so turn off the ps3
3. Get a usb and in the root put the level2 dialog file 1 and then the update to 3.50 ofw.
4. Connect the usb to the ps3 and turn it on just like in the downgrade
5. These process is automatic so in a couple of minutes your ps3 will shut down.
6. Once the ps3 is off take the usb out and make sure that the ps3 has updated to 3.50 ofw and then turn it off.
7. Then on the usb delete all thew files and then proceed to copy and paste the level2 dialog file 2 to get your ps3 out of the factory setting.
8. Once again just like in the downgrade connect the usb to the ps3 and then turn it on and the ps3 will automatically turn off.
9. Turn on your ps3 and you should be at 3.50 ofw.
10. From there you should be able to update to 3.55ofw and once there you can update freely to 3.55 ofw.
I dont really know if it will work in all the ps3 versions since I only tried it on the slim version but it should help you.
The ps3 didnt brick and is working at the moment perfectly with the 3.55 cfw kmeaw not problems.
I don't know if you can make the process faster by updating directly to 3.55 ofw instead of 3.50 ofw but the reason I choose to use 3.50 it's because its less troublesome.