Awesome. I looked into it before posting here but my google-fu failed me. Thank you.Yes, there's a homebrew test on wj44's site that does this.
edit:
Anybody with the same question go this website in your Wii U web browser: http://wj44.bplaced.net/remove_update/
I strongly recommend disconnecting from the internet or use custom DNS settings to block Nintendo servers to prevent updating.
Kinda satisfying watching it trying to redownload the update and immediately failing over and over.
Last edited by mutinize,