PSP freezing

Anyone know how to fix a slim psp that freezes after the coldboot logo?

Did you make any modifications to your flash0 files?

If not, just try formatting the flash1...

If that doesnt work then your best bet would probably be to reinstall the firmware your using.

I think I did but I've reinstalled my firmwire a cuple of times plus m id storage is corrupt.
EDIT:When I use the UPMS to install the M-33 somewhere during the installation it says psar decode error so I have to use
DAX's cementario.