ok so here is the thing i did..
i was using psp gen d2 and downloaded
some theme rcos(not able to poste links)
plese visit psp-homebrew.eu and go to catagories ;the first theme is the one.
extracted the files and replace sthe files in flash0/vsh/"something i don't remember"
and now psp is not starting.sony log comes up and it shuts down..