The Switch would see the tag and say: "This is not an amiibo."
Store files securely and redundantly
If you have a modded (homebrew-enabled) Wii U or Switch, you can dump the system's NFC keys directly. Using a tool like FTPD or Dump NFC Keys , the console extracts the keys from its own security processor. This results in a file that is unique to your console but works universally for decryption. amiibo key files
: While third-party cards are often functionally identical to official ones, Nintendo has previously taken legal action against sellers of mass-produced bootleg cards. hardware requirements for writing these files to physical tags? How To Make Your Own Amiibo Cards (2026 Update IOS VERSION) 28 Nov 2025 — The Switch would see the tag and say: "This is not an amiibo