The update file is compressed inside a .rar format to save bandwidth during download. You cannot install a RAR file directly to your Nintendo Switch.
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The base game (v1.0.0) must already be present on your console or SD card. astral chain nspupdate 101rar install
Since game updates are frequently distributed in archives to save space, your first step is to turn that .rar file into a usable Nintendo Switch Package ( .nsp ). The update file is compressed inside a