Yu-Gi-Oh! Master Duel is a strictly server-authenticated online game. If you install an update NSP via custom firmware (CFW) and attempt to connect to official Nintendo or Konami servers, your console unique certificate will likely be flagged. Nintendo enforces permanent hardware bans for modified clients interacting with their network, blocking access to the eShop and all online multiplayer. Account Termination

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While specific details about update 2.1.0 are limited, the ongoing support for Yu-Gi-Oh! Master Duel suggests a commitment to providing an engaging and evolving experience for players.