Hello, I have a psp which was originally 2.71, downgraded to 1.50 and then upgraded to 3.40 OE-A. Now I would like to upgrade to 3.52 M33-4. Can someone please tell me how to do it? Do I have to downgrade back to 1.50 then ungrade to 3.52 M33-4? What are the exact steps? What about the 1.5 recovery mode, would I have to reinstall it again? Thanks in advance.