What just happened here??

Last thing I did prior to this issue was installing “Nintendont Forwarder” on my Wii U, but once it gave me an error message that it failed to load boot.dol (or whatever it said), I turned it back off and when I turned it back on, it froze shortly after the Wii U logo showed up. I thought it would work if I uninstalled Nintendont, but it still remained frozen each bootup. What should I do to fix this issue?