To add onto this
I am using a SanDisk 128 micro sd card with an adapter (Copy protection setting turned off)
My HDD is a 250gb UnionSine (compatible with the Wii U as it'd been able to run other software perfectly fine)
I had a disk in when...
As the title says basically, I have a disk of Super Mario 3D World that I'm trying to back up onto my system. I followed the guide from wii u hacks guide (which from what I can tell is recommended). Everything went smoothly until I tried to...