Hackability Status

Sorry for the noob-like post but I've been gone for a while and have been doing research but am confused about the current hackability status (for lack of better terms) of the PSPgo and 3000. Could somebody fill me in?

Well I think there was a hole found in the PSP Go and someone was able to hack it but it wasn't released.
And I think the PSP 3000 is partially hackable but not fully. Meaning you can boot up a HEN but when yout turn of your PSP then it goes away.
I'm not sure but I think that's how it is.