has released a homebrew application for the Nintendo Wii that will download and install the new content in the v4.0 System Menu update, but leaves out the new protection
which has been added.
Download: Firmware 4.0 Updater
To quote: This application allows you to update the firmware of your console installed only the applications needed for this (IOS, System Menu, channels ...).
As a result, certain characteristics can be maintained as the bug that affects the early versions of IOS stays intact.
ps. I will update the CFW to Rev. 15 and post it today