Ok, I get 100% success rate using this modified ChickHen (tried and tested many many times by me). It basically the same ChickHen R2 but the file is organize in such a way that only one try is good enough. The only backdraw is you cannot store any other pictures like wallpaper as it will interfere with the process (this may not be the case for the other version below). It work for both PSP-2000 and PSP-3000!

There are two other version than mine below. From what people say, it both work great!!

Instruction:-
1.Plug USB and go to your PSP directory
2.Go to your PSP and delete ALL FILE INSIDE ms0:/PSP/PHOTO
3.Download the file below and open it up. There should be two folder; [PICTURE] and [PSP]
4.Extract this two file into your PSP (ms0:/)
5.Now exit USB mode.Scroll to Photo/Memory Stick in your PSP (you should now looking at your PSP not PC screen!). Once you click, ChickHen R2 will be loaded without interruption. Easy right?!.
Note:
1.There should be h.bin file in your PSP already. This is copied when you download the original ChickHen R2. So if you already a user of ChickHen you should have this.If you don't have this file, simply download from iFile mirror I provide and copy that file into ms0:/.
2.If it hang, try 'system restore' your psp. For me, one is enough so it could work back again. At least no more 20+ try on normal ChickHen :P
3.For my PSP-2000, this only works if BOTH file is extracted and copy into my PSP. However, Versions19 and assasinwarrior method (his post is just below) is different in which only [PSP] is copied. I guess it up to you to use whichever method you wanted.

Intro:
1. open chickHEN RC2 folder.

2. copy and paste the version coresponding to your psp model to ms0:\PSP\PHOTO.
-make sure you use the correct version coresponding to your psp model.
-Make sure there is no other file in PSP\PHOTO.

3. copy and paste H.bin to ms0:\ (other wise know as 'root of memory stick')

4. open modified ChickHEN v2 folder.
-copy the PHOTO folder to your ms0:\PSP\.

5. then Enter PHOTO\MEMORY and then scroll down to the last file.


Note: if further attempts does not work,
go to System > system Settings > system information, and restore default settings. then try again.
[Only Registered users can see links . Click Here To Register...] --->updated instruction

2. Versions19 also make a newer version if you got problem

Modified ChickHen V2 - 110% - Super Fast! (FOR 2000 and 3000 only)

Instruction:-
1. follow the instructions in each folder
2. unplug usb.
3. Enter PHOTO/MEMORY and just stay.no need to scroll down to the last file.
(if not successful on first attempt, scrool down to last file in the second attempt)
[Only Registered users can see links . Click Here To Register...]

Mirror:- [Only Registered users can see links . Click Here To Register...]