Remember this is called speculation for a reason.....
So on the sony PSP forums someone (idk who) made an EBOOT that launches on 3.40 firmware that crashes psp, when you turn it back on, you see that ghost flash like when you pull out the battery.
It looks like another attempt at PBP unpacking.
I don't think its bad for people to try things, even ones like this that have been done hundreds of times.
Question is, how do people determine useful glitches from "you made your psp turn off....yay?"
Tried it, and it works. Important though? Here if you would like to try http://www.wikiupload.com/download_page.php?id=139309