Follow these two steps, then download:
PSP Downloads | PSPident 0.4 and extract it to yor PSP/GAME folder, fun it and tell us which motherboard you have.
Updating to 5.03: Download and extract:
PSP Downloads | 5.03 Firmware Update to your X:PSP/GAME/UPDATE folder (Create the UPDATE folder), then run the updater from your MS in the game section to update to 5.03 Official Firmware.
Installing ChickHen: Next download:
PSP Downloads | ChickHEN Homebrew Enabler R2 and extract. H.Bin to the root (Base of your MS), and the contents of the SLIM/ChickHen Folder to your Psp's Picture folder.
After you have that on your stick, go into the System menu in the psp and restore default settings (Leave the psps name as default), then turn off UMD Cache and Umd auto load. After that go into your pictures folder, then scroll down to the bottom image.
ChickHen can take many attempts to get going, just keep trying. When it looks like it glitches and restarts, that means that it worked. If it just goes black and turns off, it failed again. :P