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System Update4.3rev05J
Technical info
TypeSpecialized IOS

IOS59 is an IOS that is only used by titles that require WFS functionality, such as Dragon Quest X and the USB Repair Channel (both Japan exclusive). It is based on IOS57 and has these WFS modules added:

  • WFSKRN - Module to handle access to WFS devices
  • WFSI - Module to install content to WFS devices

The WFS implementation in this IOS has been ported over from IOSU, the OS of the Wii U. Like with IOS58, USB 2.0 is supported.

Titles using this IOS

Version history

Version Signing bug? /dev/flash access? ES_Identify? STM Release Exploit? STM IOCTL overflow? SDI register index bug? Notes
v6689 No No No No Yes Yes Was used in the beta test of Dragon Quest X.
v7201 No No No No Yes Yes Can be found on the Dragon Quest X game disc and on the vWii-NUS.
v8737 No No No No Yes Yes First version on NUS, second version on vWii-NUS.
v9249 No No No No Yes Yes Latest version on NUS and vWii-NUS.
v32801 No No No No Yes Yes Only found on Wii mini


WFS, short for Wii FileSystem, is the proprietary filesystem used for external storage on the Wii U, to prevent piracy. It was ported to the Wii for Dragon Quest X.