Nintendo organized all content on NUS using a structured, predictable format:
Versions: Each title has a version number (e.g., v16, v64, v272). When an update is released, a new version is uploaded to NUS.
TMD (Title Metadata): A small file that lists all the individual parts (titles, content files) of a software package, including their sizes, hashes, and decryption keys (indirectly via title keys).
Ticket: An encrypted file that contains the Title Key (the actual key to decrypt the content). Your Wii U's unique console keys decrypt the ticket to obtain the title key. wii u nus
Contents: The actual data files (.app, .h3, .cert, .tik), which are encrypted and signed.
When requesting a file, the URL pattern is straightforward:
http://nus.c.shop.nintendowifi.net/ccs/download/[TitleID]/[Version]/[Filename]
If a Wii U is bricked or has corrupted system titles, advanced users can: Nintendo organized all content on NUS using a
NUS (Nintendo Update Server) is Nintendo’s content distribution system for the Wii U (and also used by the 3DS, Wii, and Switch in evolved forms).
It serves:
Unlike the Wii’s NUS, the Wii U version introduced more aggressive encryption, title versioning, and per‑title keys tied to the console’s OTP (One‑Time Programmable memory) in some cases.
Wii U NUS is a fascinating case study of dual-use technology. Built as a simple, efficient CDN for Nintendo's legitimate update ecosystem, its open URL structure and predictable formats made it a goldmine for the homebrew community. Tools built to interface with NUS provide the backbone for custom firmware installation, game preservation, and—for better or worse—piracy. As the Wii U fades further into retro console status, the ability to interact with NUS will remain critical for keeping these systems alive long after Nintendo pulls the plug. Versions: Each title has a version number (e
If you have hacked your Wii U, you can install games directly to a USB drive or SD card without using the disc drive. NUS tools download the game plus its required update and DLC, then pack them into an installable format (typically .tik and .app files) that WUP Installer GX2 can read.
For a given title+version, NUS returns a packaged set:
| File | Purpose |
|------|---------|
| tmd (Title Metadata) | Lists all content files (.app, .h3, .cert), hashes, sizes, and title key (encrypted). |
| cert | Nintendo’s certificate chain (root + CA + title). |
| tik (Ticket) | Contains title key (encrypted with console‑specific key), permissions, and signature. |
| *.app | Actual data (encrypted with title key). First .app is often the main executable (RPX/RPL). |
| *.h3 | Hash tree (hierarchical SHA‑256 hashes) for verifying .app integrity. |
| *.tmd (additional) | For multi‑content titles, a separate TMD inside the content list. |
All files are signed with Nintendo’s RSA‑2048 or RSA‑4096 keys.