Small Tutorial Step 1:
download The file in post #1
as you can see , you need 5.00 m33
step 2:
Put this file in your psp root folder
step 3:
look if its enabled in the recovery boot window under plugins
it should say "popsloader.prx[POPS](enabled)"
sorry for the haise pic but its hard to photograph a psp step 4:
if you start a psx game you should get a screen with a list of popsloaders , you can select the one before the last.
the list should look like this.
if you don't get the list , you have to uninstall and reinstall the file off post #1 and the game too