stUpiidhax, the Wii U 5.5.2 exploit (based on JSTypeHax)
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stUpiidhax: Wii U 5.5.2 browser pwn

This is the git repository for stUpiidhax, a very popular homebrew entrypoint access gate for the Wii U’s 5.5.2 firmware.


This is based on the JumpCallPop JSTypeHax (aka WiiUTest) exploit. Unfortunately, JumpCallPop’s GitHub account was removed, leaving this repo.

The latest changes to upstream are available in this repo under the fast branch. While these changes do make the exploit much faster, they also make it far less reliable. The most reliable version of the exploit available is on the stable branch, which is also the version actively hosted on my servers.


Both the stable and fast branches have changes to make them compatible with SSI, or Server Side Includes, an Nginx feature that allows the server to generate certain parts of pages without requiring PHP or something similar. A version of stable with the SSI requirements removed is available under the nossi branch.

The cg Method

The so-called cg method was used to improve reliability with some older versions of the exploit. I no longer believe that this is nesessary as the current stable exploit is quite reliable, but I figure it’s worth documenting anyway.

With an old version of the exploit, it seemed more effective than placebo to run the access gate behind a very specific server configuration. We accidentally discovered that it seemed to help if the access gate was specifically hosted on GitHub Pages, but proxied behind Cloudflare’s POPs. We tried Cloudflare’s POPs in front of a normal server as well as GitHub Pages without Cloudflare’s POPs, all to no avail. It seems something specific about running the gate on GitHub Pages and putting Cloudflare’s DDOS protection service in front of it would cause the exploit to become more reliable.

Once again, I no longer believe this is nessesary or even useful with the current stable version, but I still believe that it’s worth noting.

The cg method was accidentally discovered by Creation_ and researched extensively by myself.


Self-hosting the exploit can help improve the reliability if you have a slow internet connection. You can checkout the nossi branch of this repo and host it with any old webserver, or you can checkout the stable branch and host it with Nginx, assuming SSI is enabled (simply put ssi on; in the config file). More detailed instructions for self-hosting may be posted soon.

And Finally, Credits

Once again, all credit for the exploit itself goes to JumpCallPop and everyone else who helped him get this working. I just made a nice gateway, helped lots of people get it working, and compiled all this information.