This is MINE from another forum site:
We all love the Halo 3 ODST Audio Logs, How we search for them and how we find them by accident. First time I played the campaign, I already collected the first 21 of them before I even finished the game 1st time and found them all by accident!. Now that i finished the game a couple of times, I’m now stuck on the 24’th (Circle 8, Arc 3). I already collected them up to the 23’rd (Circle 8, Arc 2) but as I arrive at the 24th, It doesn’t glow yellow! Meaning that I can’t continue! I looked at the map on the web and my visor and I AM in the right place for the 24th audio log, but it won’t glow! I try restarting the Bonus mission “Mombasa Streets” go to the audio log and still nothing! it just won’t turn yellow meaning I can’t add it to my collection! Meaning I will never complete the collection, meaning I will NEVER get the achievement!
I’m using this:
http://wikigameguides.com/Halo_3_ODST/Guides/Audio_Log_Locations_and_Map
This is the REAL map with the audio logs in order of where they’re found.(Yes I know the 30th is hidden on Data Hive when you find the previous 29) I even watched it’s tutorial to see if I was in the right place and I was because my visor mode said so!
Just as I found and listened to the 23rd, I made a Long drive on my mongoose to the 24th and it wasn’t glowing yellow! Do I have to complete some of the other missions if I have to make it glow yellow, or do I have to restart the game form the 1st mission again?
Please this is the most annoying problem. I Googled it and NO forum site has a specific answer.