Wii U OS completely corrupted

This is my first time posting on here but I’ve always been more of a hardware/component level guy and I kind of suck at this software stuff. Is this fixable? I know enough to google the codes and that all of which lead to the OS being corrupted, and I just wanted to know if theres a way to restore a stock image back onto the system or is there some weird thing built into the wii u that prevents this from happening?