Just looking through all the guides and gathering information before i change the FW.
SO firstly i need to upgrade to 2.71:
PSP Downloads | 2.71 Firmware Update (US)
Then i need to downgrade it to 1.5:
PSP Downloads | Easy 2.71 Downgrader
Then upgrade to 3.52 M33
Any alterations would be grateful or expereinces using the downgrader