You can pay someone to do it for you or you can do it yourself. Go to
www.afterdawn.com (recommended) for step-by-step tutorial on how to downgrade and install the latest updates for psp ISOs and emulators. For psp tuts, ISO (games) and homebrew files go to
www.pspiso.com (qj.net contains some useful files)
WARNING: if you do not downgrade properly or install the wrong files there would be the risk of bricking your PSP.