Download HERE.
Turn on the PSP
Connect PSP to the PC.
Open the folder of the PSP and copy the downloaded file there (in the root of the MS)
Decompress ChickHEN Mod.zip. Replace all same files.
Now we do a safe extraction of the PSP (do not extract the USB cable altogether) and switch to PSP
Disconnect from USB
Go to Photos -> Memory Stick
Wait for the egg image to load in the ChickHEN Mod square.
When it's loaded press X