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Q: What firmware do I need to be on to install this?
A: 1.5, 2.71 SE-A, **2.71 SE-B**, 2.71 SE-C, 3.02 OE-A, 3.02 OE-B, 3.03 OE-A, or 3.03 OE-B
Download 3.10 OE-A EASY FLASHER (Double click on pic)
http://www.sendspace.com/file/7pq5rz
Step 1) Copying files onto your psp
*Back up your psp files by coping them to your computer somewhere
*Download "3.03 OE-C/3.10 OE-A EASY FLASHER.rar" to your computer
*open it up and copy "303oeflasher (or 310oeflasher)" and "303oeflasher% (or 310oeflasher%)" folders to the GAME(1.5 users) folder or GAME150(SE or OE firmware users) folder.
*NOTE - SE and OE firmware users must disable all their prxs in recovery mode, just a precaution
Step 2) Running the EASY Flasher
*place your psp on its charger, and make sure your psp battery is 75% full or more (if its not the flasher wont run)
*go on your psp and run the "3.03 OE-C/3.10 OE-A Firmware install" app.
*Follow the instructions and if all goes well you should have 3.03 OE-C/3.10 OE-A
*Format you memory stick and recopy your backup psp files to your psp
And i dont know if 2.71 has a recovery option... but 3.03 oe-c and 3.10 oe-a and all the custom firmware with a 3 have it... just use recovery (also mentioned here) to revert back to 1.5