Y2King, you need ChickHEN R2, CFW 5.00 m33-6, GEN-A*, GEN-B and GEN-D.
You must have OFW 5.03 for this to work.
in order to do this on a PSP 2000 you need to install all the above. Then load up ChickHEN R2, then load up 5.00 m33-6 then load GEN-A. Then you need to update to GEN-B then update to GEN-D.
*IMPORTANT: make sure you have the correct version of GEN-A. There is a version for V3+ motherboard and a version for the V1/V2 motherboard. If you do not get the correct on you WILL brick your PSP.
Side Note: If you were using ChickHEN R2 and Custom Firmware Enabler V 3.6 you must run Hellcat's recovery flasher. (something that I had to do)
If you don't understand, google is your friend.