How do you downgrade a PSP

You can either buy a Pandora's Battery (100% safe) and a Magic Memory Stick, or buy a downgrading UMD disk on eBay (UMD downgraders can brick your PSP). if you upgrade your psp to 5.03 ofw then download chickHEN R2 for psp 5.03 it will get you cfw which is like a downgrade