an external SD card slot, and a lot of hard work on the power supply circuit — although [banjokazooie] reports that the hardest part was cutting to size a custom PCB to mount it all on.

Legendary sudomod forum user [banjokazooie] has once again demonstrated their prowess in Wii U console modification ... WiFi, a 128GB SD card slot, two 3.7V 4000 mAh batteries, a Pololu ...