Wrong forum but still...
If your son messed it up while doing firmware update you have what we call a "brick".
A brick is where your PSP has non of the internal files that's makes the PSP run. So without these your PSP doesn't know what to do when its turned on, because there is nothing there.
Its much like trying to run a computer with a corrupt/deleted OS.
So really its time to buy a new psp or send it back to sony for a replacement (if you still have warranty)
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