That said, I understand you are looking for information regarding updating a Nintendo Switch .NSP copy of Just Dance 2021 — likely a non-official backup version used with emulators (Ryujinx, Yuzu) or custom firmware (CFW) on a Switch console.
While searching for specific update strings like "v327827644899 rar," always prioritize your digital security. Only use trusted community sources and avoid sites that require you to fill out surveys or download "download managers." The safest way to update Just Dance 2021 is always through the official Nintendo eShop servers. just dance 2021 nspupdate v327827644899rar work