Why ask when I already gave you the link explaining what it is. http://forum.romulation.net/index.php?topic=39701.0
doesnt ChickHEN work on the 6.20 firmware? because that one is made for the psp 3000 and last i knew, it was able to play games, but if i were you, i would try selling that psp and buying a psp 1001, its the best to put custom firmware
No, works only via exploiting the 5.03 firmware. There is an alternative that works on 5.50, but it's not updated anymore and only good if desperate.
If you do have 6.20 firmware, you can now play emulators using this method - http://pspslimhacks.com/papaton-2-exploit-hbl-rev-0-85-released-homebrew-on-psp-go/ And a SNES emulator - http://pspslimhacks.com/uo-snes9x-for-psp-v0032-supports-hbl-rev-85/