I not quite sure what you're asking.
If you're looking to downgrade the 3.30 Official Firmware PSP then you can use the 3.40 OE-A PSP to create Pandora's Battery.
If you're looking to upgrade the 3.40 OE-A to a M33 firmware, I'm pretty sure you can do it directly from 3.40 OE-A. PM if you have any other questions.
Bookmarks