A pandora's battery cannot be reverted back (unless you modified the firmware on the battery, rather than snipping the pins), and can't be used for normal usage. So you need a second battery.
I wouldn't recommend downgrading (cuz then you can't necessarily play newer games), just wait for a new version to be released.
Quote: "When i get a custom firmware i start it to install it and when my psp runs the install it gives me a error like
the game could not be run (Numbers)
IM LIKE FREAKING OUT MAN"
If you haven't installed custom firmware yet, you're probably installing the most recent version of m33, but you can only install the most recent version if you already have 3.60 of the custom firmware or later installed (i think that's the version number).
So if I understand the process right, you have to install an earlier version of M33, and upgrade a couple times till you get to 4.01 (or whatever version you're looking to get).
I haven't done any of this yet, I've been doing a lot of research on the subject as I'm getting a PSP in a couple days, and will be sticking custom firmware on there
Hurray for teh logd!