Okay, please, don't flame me here. I know a PSP can get bricked. I also know it can be unbricked with a pandoras battery, or, in my case, a Datel TOOL slim. Personally, I just hacked my PSP with custom firmware 3.71, and everything went fine. But I'm considering hacking someone else's PSP, which is why I'm posting. See, I bought my PSP to hack it, with the knowledge that, worse came to worse, I could buy another one. The person whose PSP I'm planning to hack couldn't buy another. So my question is this: excluding doing something stupid, like overclocking, can custom firmware screw up to the point where even putting it into service mode with Pandora can't help? I really need a definitive answer here, as I would feel absolutely awful if I wrecked this persons PSP.
Back up your Nand & IDstorage keys. Then you can restore the psp in pretty much all situations. As long as you use the nand dumps from the psp you intend to write to all is well.
Basically make the back ups before you attempt to switch his psp to cfw.
Hit the link in my sig for a MMS that can do all of the above for you quickly & easily.