As of yet, with the 3000 psp, the only way to get cfw is using chickHEN, then using cfwenabler, or similar, powering off unit will clear out ram, which is where chickenHEN is stored 'cause the mobo inside isn't hackzored yet.
3000 psp are not downgradable as of yet.
Some wonderful people are still working on making the hack permanent, and the fw downloadable, but as of yet, there is nothing of this sort.