so I finally decided to play halo 3 odst and data hive wont show up on my map so i cant play the mission b/c the door is locked. I redid the mission 3 times the 2nd time my map showed all the previous missions i did a 3rd time it stayed the same as the second time. help?
(I also wanna do it on legendary so if anyone wants to help me with that as well add me on live?)