When I put in my multiplayer disk from Halo 3: ODST it doesn’t download the disk, instead it recognises it as normal halo 3 but then doesn’t let me play it. Any help?
The icon for the Mythic disc will have the same cover art as Halo 3 – The file size, however, should be significantly less. If you’re having issues with the download try to do a hard restart on the console. Push down the power button for 10 seconds while the system is on. The system will take some time to boot back up but this process will clear cache and should resolve any issues you have with backwards compatible game downloads.
Try posting your back-compat issues here: https://www.halowaypoint.com/en-us/forums/82841d11296340069f6b8e3ccbfcee11/topics/back-compat-issues/3536019f-2beb-49f3-be69-fe8dd26589fc/posts
Best of luck, and Happy Haloing!