1) Wrong section
2) Which firmware to use for what? If you are using it with legit games, then OFW 6.20 (I think thats the latest one?) is the best. If you want CFW, you need 5.03, above won't work.
3) The PSP 1000s are ALL hackable with Pandora, no matter what firmware is on, MOST 2000s are hackables and VERY few ones are able to CREATE Pandora (and TA-088 V3 mobo can't use a Pandora) PSP 3000s/PSP 2000s (w/ TA-088 v3) NEED 5.03 so you can enable ChickHEN R2 and install 5.03 GEN-C to play the latest games in ISO/CSO format.
Any more questions? (Hopefully ones that are more clear)