yellows8 has updated the github page with a few things: https://github.com/yellows8/wiiu_browserhax_fright
it doesn't look like there's any kind of browser block like 9.9.0-26+ for 3DS: https://github.com/yellows8/wiiu_browserhax_fright#browser-https-urls5.5.1: Originally this exploit was thought to be fixed via doing manual code-RE(hence why it was released when it was). However, that was actually wrong due to misreading that code: this exploit works fine as-is on 5.5.1(no testing on 5.5.1 was done before release, only code-RE).
As of 5.5.1 the only HTTP(S) URLs for code-binaries under Internet Browser "code/" are: internal-testing URLs, web-searching, "favorites" URLs, the Wii U version of the browser-filter also used for JPN-New3DS(https://3dbrew.org/wiki/Internet_Browser#New_3DS_Internet_Browser), etc. That is, as of 5.5.1 there's no known Wii U equivalent to the following with 3DS: https://3dbrew.org/wiki/Internet_Browser#Forced_system-update














