http://digiex.net/guides-reviews/co...y-psp-psp-psp-slim-psp-3000-psp-go-e1000.html

This seems to be permanent by the looks of it but eCFW is pretty good too, as long as the device is always kept on standby mode so it's as good as perm.

 

@CIAwesome526
Basically 6.20 CFW had some sort of a permanent patch which is sort of like a permanent CFW. There is no point in downgrading to any firmware below 6.20 as the 3000 never had a permament CFW below that firmware. Though you should be careful as some 3000s cannot be downgraded to 6.20 as their factory firmwares were higher than that.

What you should do is download this: http://www.mediafire.com/download/pb9gccudpf8okc1/PSPIDENT_075_21-10-2011.zip

Extract the zip file and place the PSPIDENT folder to ms0:/PSP/GAME.

This homebrew will tell you whether your PSP can be downgraded to 6.20 or not.

 

Of course yes.

To the first question, there is no need to downgrade. Just get the lcfw ME and you are set.

 

You can force a PSP below its factory firmware, but you'll run into a lot of instability and issues, maybe even brick it. I'd just go with a temporary CFW or HEN, like LME. It's not that inconvenient and will probably do everything you want it to.