My environment and results
Wii - 4.0U
Homebrew Channel installed (CIOS Uninstalled)
1) Unpack the archive linked above.
Okay.
2) Do a full backup of your SD card on the PC, and DELETE everything from the card.
Okay.
3) Copy the apps folder on the SD card.
Okay.
4) On the Wii, launch the Homebrew Channel and select CMDVDX34, then pick "Downgrade IOS35", wait for it to end and come back to the menu, then exit.
- If it says "Failed to add title, maybe you already ran this?", find
IOS35-64-v1040.wad from a disk such as Brawl-Mario Kart-WiiFit, using downgradehelper.bat or "
elsewhere" and install it using WMIOS35 or a regular Wad Manager, then exit and continue to follow this guide.
- If it says that "you're a pirate" delete also all your VC/WiiWare pirated channels (with
AnyTitle Deleter or WAD Manager), execute shared2clean and try again
Okay.
5) Execute downgradehelper.bat in the "PC" folder of the archive and insert 1, it will download IOS36 from NUS and patch it to cIOSv9, then pack the WAD. (alternatively, you can find and use the cios_fix.wad).
Okay - I acquired, 'cios_fix.wad'
6) Copy the cios wad in the wad folder in the SD card.
Okay.
7) Delete the apps folder on the SD, rename the "apps2" folder included in the archive to "apps" and copy it to the SD.
Okay.
8) Launch the Homebrew Channel again, and run WMIOS35.
Okay.
9) Install ciosv9.wad.
This is where i get stuck with a 'RET-2011' type error
10) Exit again, and run IOSDowngraderv1 from HBC.
11) If you want a System Menu lower than 4.0, use cIOS Downgrader
Thanks to comex for DVDX 3.4, to WiiPower for providing a version of the WAD Manager source compatible with the latest devkitPro and libogc and to WB3000 for NUS Downloader.
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Other people have provided their methods (using similar instructions in a different order) which does not seem to work for me.
Any thoughts for people who got stuck in a similar area or any other directions?