it may not be designed to update that portion of the wii u. the original icon may be saved. the icon is tga file, I don't know if there are others or it's saved that way on purpose. when I dumped my saves with system config tool, it dumped the icons for the saves as well, so I don't think those change. the icon tga is a meta file.
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all cbhc installer does is change the icon, it doesn't reinstall the game with the rom.zip. that's essentially the core of cbhc, the rom.zip.
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I remember this from when you had to use wup server to install haxchi, normal haxchi, since there was no installer. you had to inject the rom.zip manually with wup, and it was slow as shit like single kilobytes speed.
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here's how to change the wara wara plaza icons (you have to grab the icontex.tga from the game, then inject them into the wara wara plaza title id folder after you've encrypted them. cbhc only changes the icontex.tga in the original game's folder. it's part of the meta folder inside brain age.
https://gbatemp.net/threads/i-perma...ull-of-my-personality-and-you-can-too.562257/