Click [url=http://www.iskysoft.com/download-psp.html]here[/url] to get the application pack(Find the Guides label on the right side,which named Download for PSP downgrade application)
Downgrade Psp To Version1.5 Using Psp Battery I. Get ready (Reformat PSP memory stick) Before you get started with the downgrade, you need to reformat your PSP memory stick. If you don't know how to reformat it, you can refer to the steps below: 1.Press the HOME button on the bottom left of your PSP.2.Use the arrow keys to move to the Settings area, then move the up and down keys to go to System Settings.3.Push the "X" button (or the "Oâ...... Source : Email Software
