I was curious about a few things... Do we know if Nero ever retrieved the board of protection codes for Earth's defense? If so, why were they never used, or was it pointless to even have them in the first place? Also, would the black hole red matter thing even work after the supernova has taken place?
Since he attacks Earth, I'm thinking yes.
Work in what way? Absorbing the supernova? We know Spock created a red matter black hole even after Romulas was destroyed, so the assumption is he created it to stop the supernova from causing more destruction.