Because these files are intellectual property derived from Nintendo’s proprietary hardware, they cannot be officially distributed by tag-making apps.
While owning the software to write NFC tags is legal, downloading unfixed-info.bin falls into a legal gray area because it contains copyrighted decryption keys. Most users extract these keys from their own hardware or find them via community-driven educational repositories.
There are several versions of these files floating around the internet. If the software says the keys are invalid, you may have a corrupted file or a file renamed incorrectly.
unfixed-info.bin is a cryptographic key file used to decrypt and encrypt Amiibo data. Amiibos use Near Field Communication (NFC) technology to interact with Nintendo consoles. The data inside an Amiibo chip is locked behind Nintendo's proprietary encryption. To read, alter, or clone this data, emulation software requires specific master keys. unfixed-info.bin is one of the two mandatory files needed to unlock this data. The Amiibo Encryption Architecture
In simple terms, unfixed-info.bin is a small, binary ( .bin ) data file that contains an used in the encryption and decryption of Amiibo data. It is part of a set of essential cryptographic keys that allow third-party applications to read, write, and generate the data associated with these interactive NFC figures and cards. unfixed-info.bin
Here's a step-by-step guide on how to load the unfixed-info.bin file into TagMo:
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.
What it is
Corrupted or improperly downloaded files will cause cryptographic operations to fail silently or crash the application. Always check the file properties: unfixed-info.bin must be exactly . locked-secret.bin must be exactly 80 bytes . Because these files are intellectual property derived from
A 7-byte serial number hardcoded by the manufacturer (NXP) into the chip. No two chips have the same UID.
To understand unfixed-info.bin , you first have to understand how an Amiibo is structured. Every Amiibo contains a small NFC chip (NTAG215) with encrypted data. This data is split into two main conceptual parts:
If you are looking to create backup copies of your digital collection or explore the technical side of NFC emulation, understanding this file is essential. 🛠️ What is unfixed-info.bin?
Here’s where it gets fun. A tiny corner of the internet believes unfixed-info.bin is a stray artifact from an early build of Windows Longhorn (Vista’s doomed predecessor). The theory goes: There are several versions of these files floating
If you have ever looked into backing up your Amiibo collection or duplicating figures using NTAG215 NFC tags, you have likely encountered the term . This tiny but critical file is one half of the proprietary encryption key pair required by software like TagMo to read, decrypt, and write Amiibo data.
If you're ready to start your project, I can help you with the next steps. How to verify if your with NFC writing?
Once loaded, TagMo will show that keys are registered, allowing you to load Amiibo dumps ( .bin files) and write them to NFC tags.
Raw Amiibo Dump (.bin) ──> Requires ──> [ unfixed-info.bin ] ──> Decrypts Game Progress & Stats ──> Requires ──> [ locked-secret.bin ] ──> Decrypts Character Identity Step-by-Step Implementation Guide