i Have a freinds psp with normal 3.51 that i am trying to downgrade to 1.5. I took my psp with 3.52 m33 and made a pandoras battery and magic memory card. Now I put the battery into my friends psp with 3.51 firmware and I inserted the battery and nothing happens. The XMB doesnt show. Nothing but the green power light comes on. Did I ruin a battery. Please somebody HELP!!!!! Is there a shortcut to the pandoras menu or something?