Atarizero, sorry to hear about your bricked PSP. Baka pwede mo ipa-repair ung console sa Sony? After its repaired, you can try downgrading to 3.03 OEC again.
its an option. but since the cause of the brick is because of the upgrade/downgrade process, it will be deemed by sony na out of warranty yan because of tampering.
baka ang cost dun is the same as buying a new PSP.