Get a pandoras battery and magic memory card...
Custom firmware is needed to do it, and if custom firmware is installed on the PSP in use, a plugin can be installed.
Cause you need to make you PSP Go To the lowest firmware (kinda like downgrade) Then you can install you custom firmware
No, you have to downgrade first.
Hacking the firmware depends on the PSP's motherboard, not the current firmware installed. If you're asking whether or not it can be made into a custom firmware, then the answer is yes, but all homebrew would have to be rewritten for it.
You must have a firmware installed other than the Official Sony firmware in order to use psp-pda. If you need help putting a "Custom Firmware" onto your psp you can find an almost limitless selection of tutorials online. Then you just need to place it in the game folder.
you won't be able to buy a psp with cfw on it. instead check out this Pandora battery and magic memory stick guide which will help you install cfw. http://www.pspmod.com/forums/psp-hardware-guides/28839-easy-use-pandoras-battery-guide.HTML
Yes, the custom firmware is all stored on the PSP's internal chips and memory, you can do what you want with the memory card you used to install it, it is no longer needed, and you can replace it with your regular memory card.
Yes. However if you have a more recent firmware such as 6.20 or 6.10 you cant. It only works with psp 1000 and 2000
It's not the firmware that matters, it's the motherboard. A hackable motherboard can have custom firmware installed no matter what version of the official firmware it uses. 'Unhackable' (at present) ones can't have custom firmware installed at all right now. All phat PSPs can be hacked, most slims can, but recent ones can't, and at present, PSP-3000's can't at all.
I'd say 3000 for features that it offers like skype, but you don't want to waste money on games so PSP slim and lite is better because it can be installed with a custom firmware. Note: Once you buy the PSP install the custom firmware immediately, search for: PSP CFW 5.00 m33
You're in luck! There seems to be a homebrew enabler out for official firmware 5.03. http://www.youtube.com/watch?v=lPMiNTbL7YQ
Get another battery. You should of had backup files on your PSP battery.