Need help updating ps3 error

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How do i fix this so i can play Black Ops 2 Multiplayer again.???

Yesterday, my PS3 automatically downloaded the 4.21 update and prompted me to install it.

I searched all over the internet for the solution of this problem ,it's been bugging me for months now..

I also did the MAC Address thing, and still no luck!

To do this too you will need:- A USB stick with a good copy of the firmware you were attempting to upgrade to;- A second hard drive that you don't mind erasing 1.

Allow the PS3 to get to the end of the the broken install, and shut it off with the switch in the back.2.

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