you don't have access to the recovery menu options, so I think your PSP is fried.
If it was a CFW psp you would only need to format flash1, loosing all settings, but that would be it.
You should've never messed up with the Flash on a PSP 3000.
Solution, send it to sony, tell them it got shut off while upgrading. And if it doesn't have warranty anymore, you'll need to buy a new motherboard.
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