Okay i'm not going to be on skype for long so if you still need help follow this tut
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What you do is install the downgrader 4.25to3.55
Once you do that download the toggle qa pkg and run it
Then go to your network settings just hover over it don't click it
And press this combo at the same time L1 + L2 + L3 + R1 + R2 + dpad_down
If it worked you should see Edy Viewer, Debug Settings, and Install Package Files under network settings if it didn't work just run the pkg again
Now just install your normal downgrader to downgrade back to 3.55 rebug
Then install the 3.55 cfw firmware he was on before updating to rebug
BTW all the downloads you need are in that link and thats how i fixed my error
Thats it hope i helped and make sure to tell him to toggle qa before going to rebug next time