Any way to dual-boot firmware on the PSP Slim?

Hi all, I'm a noob here and curious as to whether there's a way to set up my PSP Slim so I can 'swap' between the current 'legit' Sony firmware and custom firmware? Right now I have no custom firmware on it at all.

Thanks!

i have the slim and bought it with m33 on ebay, just put in irshell about a week ago and it starts up with that , has a start up animation video, and a custom irshell skin. works great, every now and then it freezes but i just turn it on and off. you can then change to the xmb, or run both.

i dont think there is a dual boot but wat would you want a dual boot for? custom firmwares are designed by the code of sony firmware and they add there own files into the sony encrption so basically custom firmware is sony firmware with modifications in it that let us the community do what we want