Go into the English folder and copy all the files inside (usually 3 .txt or .ini files). black ops 2 sound bank failed to load cmn-root.english

Look for files named:

Navigate to your Black Ops 2 installation folder (usually: SteamLibrary\steamapps\common\Call of Duty Black Ops II). Open the redist folder. The error "sound bank failed to load cmn-root

Step B: Clear the Steam Download Cache

If verification fails to fix the issue, the Steam downloader cache may be stuck. black ops 2 sound bank failed to load cmn-root.english