I'm freaking lost here buddy.
So your stuck on the Rogero 3.55 downgrader correct?
The only way to get out of that is to update to Rogero 3.55 v3.7
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I would suggest to use Rogero 3.55 downgrader again and try Rogero 3.55 v3.7
I can't see why your shit wont update since you QA flag and did the system update.
Is your Ps3 fully functioning...like all the part working?
Sometimes the Ps3 won't let you install the update if there is something broken e.g. blu-ray