NOTE: I am not responsible if you brick. Hi there. This tutorial will allow you to use custom SSL certs in the Wii U's browser. This will not need signature patches to run, but it does require them to make the modification. This has been tested with a 5.5.1U system with Haxchi enabled. Activate CFW or signature patches using Mocha, Haxchi, or CHBC. Go into FTPii Everywhere. On an FTP client, navigate to /storage_mlc/sys/title/00050030/10012x0a/content/browser where x is 0 for Japan, 1 for America, and 2 for Europe. Download the file rootCA.pem. Open this file in a text editor. Find some root certificates (in PEM format) to add to the file. If they aren't in PEM format, convert it using OpenSSL. Personally, I would recommend adding Fiddler's root cert, and the DST Root CA X3 root cert (which will make Let's Encrypt sites, such as GBATemp, work with the Wii U). PEM certificates can also be obtained (in Windows) by exporting them from the "Copy to File" dialog which comes up when you view a certificate's properties. Append the desired certificates to rootCA.pem and save it. Upload it back to the Wii U. Test it by opening the browser, and visiting a site that uses your certificates. If it worked, you should not be prompted to manually allow SSL connections to hosts that use those certificates. I hope you found this tutorial useful! Feel free to reply with any questions!