D
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What is it DLC for? It checks by title ID, and as far as I know, title IDs are unique between titles.Someone messaged me the problem, although it hasn't happened to me so I can't say if it is really the case:
The person tried installing a DLC .cia, but FBI said that it was already installed and gave the option to overwrite. The person says that he is sure that he never installed the DLC before, so I'm wondering if it's a bug due to how the Unique ID of a game is the same as its DLC and patches.