Unfixed-info.bin

Several hardware and software tools rely on these encryption keys to function: Hardware Cloners

: Once the keys are loaded, you can use the Load Tag button to select your specific Amiibo character files. Related Technical Terms unfixed-info.bin

the files for the "Unfixed" key and "Locked" key respectively. Several hardware and software tools rely on these

unfixed-info.bin

Every physical Amiibo figure, card, or plush contains an embedded NTAG215 NFC microchip . These tags store exactly 540 bytes of data structured into two core sections: fixed data and unfixed data. Nintendo protects this data using specialized cryptography, which relies on two separate master keys to sign and secure the information via an HMAC-SHA256 protocol and AES128 encryption in counter mode. These tags store exactly 540 bytes of data

The required to decrypt, modify, and replicate Nintendo Amiibo data. Alongside its counterpart, locked-secret.bin , this small 80-byte binary file allows backup applications to interpret the rewritable portions of an Amiibo's internal NTAG215 NFC chip. Without unfixed-info.bin , custom Amiibo creator tools cannot bypass Nintendo's encryption algorithms, rendering raw character data unreadable and unwriteable. The Cryptography Behind Amiibo Tags

This includes dynamic, rewritable game properties like character nicknames, training levels, stat adjustments, cosmetic items, and game-specific progress (such as Super Smash Bros. spirit training or The Legend of Zelda companion data).