Unfixed-info.bin

To understand why unfixed-info.bin is necessary, it helps to understand how data is organized inside an Amiibo's NTAG215 chip. An NTAG215 chip has 540 bytes of total memory, divided into 135 pages of 4 bytes each. Nintendo divides this memory into two distinct operational zones: The Unfixed Data Region

This guide provides a comprehensive overview of the file.

: Unless you are a game developer working with Unreal Engine, assume the AMD origin first. unfixed-info.bin

One of the most common issues users encounter with unfixed-info.bin is the "Key file signature does not match" error. This error is almost always a result of one of the following:

The unfixed-info.bin file contains the cryptographic "unfixed" keys, which are used to handle the part of an Amiibo's data that can change, such as save data (e.g., character stats in Super Smash Bros. ). It works in tandem with , which handles the static data that never changes (like the character's unique identity). How it is Used To understand why unfixed-info

Nintendo encrypts their NFC data to prevent unauthorized duplication. Because these encryption keys are proprietary property of Nintendo, developers of backup software cannot legally "hardcode" the keys into their apps.

: Contains data related to the "unfixed" part of the Amiibo's internal memory (serial numbers and unique IDs). locked-secret.bin : Unless you are a game developer working

If you have encountered an unfixed-info.bin in a unique or unexplained location, consider sharing your findings on tech forums like Stack Overflow or Reddit’s r/techsupport—your experience may help decode this digital curiosity once and for all.

In almost all NFC emulation scenarios, unfixed-info.bin does not work alone. It is paired with another file: .

The filenames of the key files (unfixed vs. locked) directly correspond to the type of data they are meant to secure. The unfixed-info.bin file handles the variable information.