If you still need a “fixed” NSP for error 206, search for releases that explicitly state:
Note: Always scan such files with antivirus and use a VPN. Many “free fixed NSP” sites contain malware or fake downloads.
If you are using custom firmware, ensure your actual Switch system version supports the update. Go to System Settings → System → System Update. You need at least 14.1.2 for ACNH 2.0.6. If not, update your CFW and official firmware.
The “fixed” version of the NSP update addresses two of these issues: it repacks the offending NCA files and includes a patched ticket that works with standard sigpatches on firmware 15.0.0 and above.

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