You will need :
1.A psp that runs some kinf of custom firmware (borrow from a friend)PSP1
2.Another PSP that you want to downgrade (Downgrade=Play Copied Games)PSP2

Step 1 : Download this file 

Step 2 : You will find some files inside - 150.PBP,340.PBP,380.PBP,Folder:Cementerio,Folder:Pandora Installer.
Extract them somewhere.

Step 3 : Put a memory stick of 256Mb or more in PSP1

Step 4 : Copy the folder "Pandora Installer" in the Games Folder in the memory stick (ms:/PSP/GAME/Pandora Installer)

Step 5 : Go to Games and execute it as if it was a game.

Step 6 : Hold Right (R) and Press X

Step 7 : Hold Right (R) and Hold Left (L) and press X

Step 8 : When this finishes your memory stick will be empty

Step 9 : Get on the memory stick again through USB and copy bith folder now (Pandora Installer, Cemeterio) on the same location as if they were Games (ms:/PSP/GAME/Pandora Installer)(ms:/PSP/GAME/Cemeterio) The folders will not be present, so create them!

Step 10 : Copy the files 150.PBP, 340PBP, 380.PBP in the root of the memory stick (ms:/150.PBP,ms:/340.PBP,ms:/380.PBP

Step 11 : Go to Games and run the program "Cemeterio"

Step 12 : Press X

Step 13 : Go to games again and run the previous program : Pandora Installer

Step 14 : Press Circle (O)

Step 15 : Take out the battery and the memory stick

Step 16 : Insert battery and memory stick on PSP2

Step 17 : Wait until a welcome screen shows up and press X

Step 18 : PSP2 is fixed and can play copied games or homebrew, or is recovered if it was brocken

Step 19 : Turn on PSP1 without the battery and the memory stick using the power adaptor

Step 20 : Put the battery in

Step 21 : Put the memory stick in

Step 22 : Go to games and run Pandora Installer

Step 23 : Press Square 

Step 24 : Restart using the battery only but take the memory stick out

Step 25 : Put the memory stick in

Step 26 : Format the memory stick from the settings menu

Step 27 : PSP1 is as it was before.


A fine release by me :)  https://scripts.doulevo.com 
I am on 2 Mbits only. I will Seed, but if you find it usefull, please seed too!!