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The error code 800233Ef on Playstation 3 is related to failed downloads. There does not seem to be a solid answer on what exactly that error code means and it is suggested to contact Sony for help.
This is an invalid error code. Please check the code again to make sure you have it copied correctly.
Do a System Update from the Start menu!
ribbon cable from BD drive to motherboard
It is a server overload. Usually around evening times when you are trying to redeem something this error code pops up. Try redeeming that thing later