Technically, is a 160-byte binary file containing the cryptographic keys needed to handle the "unfixed" or "unlocked" data sections of an Amiibo.
The primary home for unfixed-info.bin is within applications like (for Android), PyAmiibo (a Python library), and Smash Amiibo Editor .
If you were to open unfixed-info.bin in a hex editor, you would likely not see human-readable text. Instead, you would find a structured 80-byte binary sequence that is interpreted by software like PyAmiibo as a cryptographic key rather than a simple data store.
The unfixed-info.bin file is utilized across a broad ecosystem of open-source applications, homebrew software, and hardware emulators. 1. Mobile Amiibo Emulation (TagMo and AmiBoss)
Is it a virus? A corrupted system log? Or just a harmless piece of digital detritus? unfixed-info.bin
A: Without it, you cannot encrypt new Amiibo data. Many tools, including TagMo, will fail to write or load any Amiibo data until you re-import the key file. You will need to download it again from your backup or from a community source.
From the outside, unfixed-info.bin looks like just another obscure system file with a .bin extension. However, it plays a vital role in Nintendo's Amiibo ecosystem. It is the data master key that unlocks the ability to read, write, and authenticate the static identity of every single Amiibo figure.
After digging through forums, GitHub issues, and even a few IRC logs (yes, people still use IRC), patterns emerge:
A: While many older guides focus on Android, modern iOS devices with NFC capabilities can also write Amiibo tags using apps like CattleGrid or Placiibo. However, the specific requirement for unfixed-info.bin varies by application. Technically, is a 160-byte binary file containing the
. The file is essentially a temporary artifact. Deleting it will have zero impact on gaming performance, video playback, or stability. The worst that happens is that AMD’s next update recreates it from scratch.
: They are not provided with apps due to copyright but are widely available in community archives like Reddit's Amiibomb .
Information that never changes, like the character ID.
: The software uses the AES-128 standard in Counter (CTR) mode alongside a calculated Initialization Vector (IV) to decrypt the game save region. Instead, you would find a structured 80-byte binary
The locked-secret.bin operates similarly. It is a , used to derive Amiibo-specific tag keys for signing the fixed/locked information of the Amiibo, like the UID and Amiibo type.
To get started, you will need to place three types of files on your Android device (typically in a folder like Downloads or a dedicated Amiibo folder):
If your 3DS is failing to boot or System Settings is crashing, checking the integrity of this file is a standard troubleshooting step. Because the file is not "fixed" (meaning it can be modified or updated separately from the core OS), it can sometimes become corrupted during a bad transfer or a sudden power loss while saving.
This file is a critical component of the ecosystem, specifically relating to firmware updates and the System Settings application.