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System upgrade, prompt fffffbda error, syssetup.dll upgrade program signature failed.
Fffffbda error, syssetup.dll problem, it is conceivable that the system disk you bought may not be very good, and there is a problem when decrypting the system!

Syssetup.dll's main program name is RemoveOOBE. It's a Microsoft system patch, mainly because your system is not genuine, at least it's not easy to decrypt and burn!