Check if you have a TA-82 Motherboard!!!!! Open your UMD case, and if you see writing on the inside in the upper corner like this:



Then you need to take a very importiant extra step or else you will have a brick. Somewhere included with the downgrader is a peice of homebrew that will change your firmware keys so that this brick doesn't happen. You need to run that before you downgrade from 3.03.

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