heres what you SHOULD be doing...
1) turn the psp fully off and back on again (presuming u already HAVE 5.03OFW installed)
2) go to system setting and choose restore defaults.
3) when the psp boots - turn off umd cache
4) go to photos then the chickhen folder. DO NOT PRESS X on any picture, do not scroll up and down, simply scroll down ONCE.
5) wait
6) you psp will now do 1 of 2 things....
1)it will click and turn off. in such case you should go back to step 3
2) it will display a black screen with some wierd green pixels on the screen, then it should reboot. in this case check the system info to see it chickhen has loaded correctly. then you could use a cfw installer if u so wish.
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now that process stands for ALL versions of chickhen, but I'm going to give u a few different versions below, you MUST TRY AT LEAST 10 TIMES with each version before changing, and start with R2 then R2 mod 1 then R2 mod 2, in order basically...
ChickHEN Homebrew Enabler R2 for Frimware 5.03 | HEN for PSP-3000, PSP Hacks - PSP Slim Hacks the original
ChickHEN Mod - Load ChickHEN smoother | ChickHEN R2, PSP Hacks - PSP Slim Hacksthe first mod to help improve compatability
http://kefler.110mb.com/the 2nd mod, this one the download link is at the top of the page...
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once chickhen is running if u want to run iso/csos then u need cfw, that can be CFWe 3.6 or GEN-A, look in our tutorials theres a nice guide there...