Umm my old psp (fat one) is pretty much broken, it cant read umds, cant enter sleep mode and is running on 3.40 oe-a firmware, so it can still run isos/csos. Ive changed the umd laser but that didn't fix the problem so im thinking of buying a new slim psp and upgrade it to 3.71 m33-2. Just outta cursiosity, is 3.71 m33 just as good as 3.40 oe-a by that i mean like does it basically function the same when running an iso or cso game? Also is it hard to make a pandoras battery? Sorry for asking to much questions but my old psp is just annoying me..