How do you upgrade your PSP from Version 3.52 to Version 4.05?

What exactly is my PSP Version?

hi i just brought a new PSP (this is my first PSP ever had i dont know much about PSP) with a version of "5.50 Prometheus" im planning to upgrade it so any advices which version should i upgrade into? i seen version "5.50 Prom 4" etc..im confused my PSP only show "5.50 Prometheus" which leads me to wonder around
Answer:

Here man this will help you out quite a bit. If you need more help just ask on this site. http://forums.pspslimhacks.com/threads/guide-what-is-the-latest-cfw-lcfw-for-my-psp-1000-2000-3000-or-psp-go.7779/ Tell them I sent you :D

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