unfixed-info.bin is a system resource file used by the Nintendo 3DS operating system (HOME Menu/System Settings).
Because these files are intellectual property derived from Nintendo’s proprietary hardware, they cannot be officially distributed by tag-making apps.
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
This file is not something you would interact with directly. It's a background component used by specialized third-party tools for Amiibo data processing. Two of the most common applications are:
The solution often involves deleting all existing key files from your TagMo environment and replacing them with a fresh, verified version of both unfixed-info.bin and locked-secret.bin from a reliable source. unfixed-info.bin
: The tag encryption master key (80 bytes). (Note: Some legacy configurations combine these into a single 160-byte file called key_retail.bin ).
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In May 2023, Nintendo released firmware update for the 3DS.
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 unfixed-info
The name itself—suggesting "unfixed" or incomplete information—triggers immediate suspicion. In this comprehensive guide, we will dissect every aspect of unfixed-info.bin . By the end, you will know exactly what it is, why it exists, whether it poses a threat, and the precise steps to take if you find it on your system.
This installs the bare driver without the telemetry and CIM tools that generate unfixed-info.bin . Note: You will lose features like Radeon Chill, ReLive, and performance tuning.
In practice, these tools cannot decrypt or manipulate raw Amiibo data dumps (BIN files) without the master keys. The user must first load unfixed-info.bin and locked-secret.bin into the application. This process provides the tools with the fundamental keys to properly interpret any raw.bin dump taken from a physical figure.
Use a or a simple command-line tool to peek at the first few bytes without executing. It's a background component used by specialized third-party
: When writing to a blank NTAG215 tag, the app uses this key to re-encrypt the data so a Nintendo console will recognize it as an official product. How to Use unfixed-info.bin
Ensure you have both the unfixed-info.bin (data key) and locked-secret.bin (tag key), as one cannot function without the other for full encryption/decryption. If you'd like, I can:
Sometimes, developers and homebrew users combine these two 80-byte fragments into a single, cohesive 160-byte file known as key_retail.bin using a simple command-line merge: cat unfixed-info.bin locked-secret.bin > key.bin Use code with caution. Why Is unfixed-info.bin Required?