I keep going to add the codes for ALPHA-HALO … i have all terminals but i keep getting the message … This data is locked. You must first access Terminal 1 on or near Installation 04. … or whatever terminal i am trying to access. Can some plz help me and tell me what i need to do… Thanks
The Alpha Halo Archives are for Halo: CE Anniversary. According to your Activity on Xbox.com, you haven’t played it!
Hope this helps, and welcome to Waypoint! 
Try playing a game or two of Halo: Anniversary on the first level, it may force update that you’ve unlocked the Terminal.