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Tutorial:Online Play

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Revision as of 00:36, 5 April 2019 by Serfrost (talk | contribs)
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Before you get started

There are several items you should prepare before continuing with this tutorial, these are as follows:

  • You'll of course need to own a Wii U
  • A regular SD card (or mini/micro with an adapter) of virtually any capacity
    • Your SD card has to be formatted FAT32 for the Wii U to be able to read it and the allocation unit size is best set to 64KB (or 32KB if you encounter problems with 64KB).
    • On larger SD cards (64GB+) Windows will likely not let you format the card FAT32, to circumvent that use guiformat
  • Your Wii U is able to connect to your WiFi network to be able to dump files via FTP
  • Also make sure the Wii U account you want to dump/use has the "Save password" option checked (auto login)

Preparing your SD card on your PC with the necessary files

If your SD card is formatted correctly it is time to copy the necessary files to it.

I recommend downloading the prepared zip file from - select Wii U only

It pulls (almost) all the required tools from their official sources and neatly packs them into a archive that is ready to be copied to your SD card as is.

Once you have downloaded the archive simply extract the contents right onto your SD card keeping the folder structure of the archive intact.

  • If you use CBHC (Coldboot Haxchi) [Requires purchasing a $7 VirtualConsole Game]:
  • If you want to use Regular Haxchi or Mocha CFW, you'll need to install some alternative files:

Launching the web exploit and loading up the Homebrew Launcher

If your Wii U is running on system update 5.5.2 or 5.5.3 the browser exploit might require many tries to get to work.

To make the process of retrieving the required online files easier you can patch a DS Virtual Console game to launch the Homebrew Menu, that way you only need to do the browser exploit once - to patch the DS VC game.

The following DS VC games are supported:

The cheapest are Brain Age (USA) or Dr. Kawashima's Brain Training (EUR) at around $7.00 USD which can be purchased and downloaded in the eShop app.

If you don't own any of the listed DS VC games nor want to buy any of them then you will have to do the browser exploit twice, once for dumping the otp.bin & seeprom.bin and once for dumping the rest of the files through FTPiiU Everywhere.

This tutorial will cover both routes.

For system update 5.4.0 to 5.5.X

  • Make sure the Wii U is turned off and insert the SD card you have prepared on your PC
  • Boot up the Wii U, launch the browser app and open the curtains by pressing (X) on the gamepad
  • Go into the browser settings and choose Reset save data
  • Open the URL (it is recommended that you bookmark this URL since you might need to try this a couple of times)
  • Press the Exploit button for your firmware and wait.
  • If the Homebrew Launcher loads up you were successful, if your browser is frozen you need to try again (hold the power button until the console turns off and reboot it)
  • This might take a good few tries, resetting the browser save data after every attempt might aid this process.

If you get a FSGetMountSource error trying to load the Homebrew Launcher try going into the mii maker and save a screenshot of any Mii to the sd card, this usually fixes potential inconsistencies in the SD file system that might have caused a conflict.

(Optional) Installing Haxchi on top of your DS VC game

Skip to Chapter 5 if you don't own any of the DS VC titles listed at the beginning of Chapter 3 and don't want to buy any.

Assuming you are now in the Homebrew Launcher choose Haxchi from the available apps and once it's launched select the DS VC game you want to install Haxchi over (this will basically replace the shortcut to start the game with a shortcut to start the Haxchi CFW and the Homebrew Launcher).

When it is done you will be booted back to the system menu and you should see your DS VC game's icon replaced with the Haxchi symbol.

Launching it while holding (A) on your gamepad will launch the Homebrew Channel again.

Dumping the required online files for Cemu

  • While in the Homebrew Channel launch the nanddumper app. Note that when Mocha is on, nanddumper will not work. So you may have to reboot your Wii U first.
  • In nanddumper set OTP (1KB) and SEEPROM (1KB) to <yes> and everything else to <no>.

The otp.bin and seeprom.bin will be dumped onto your SD card, afterwards your Wii U will reboot.

If you have installed Haxchi on top of a DS VC game

  • Go back to the Homebrew Launcher through Haxchi (holding (A) on your gamepad)
  • Once you are back in the Homebrew Launcher select and launch Mocha
  • Leave the Mocha settings as they are and press (A)
  • Your Wii U will boot you back to the system menu, simply go to the Homebrew Launcher through Haxchi holding (A)
  • Launch ftpiiu_everywhere

If you haven't installed Haxchi on top of a DS VC game

  • Repeat the browser exploit from Chapter 3
  • Once you are back in the Homebrew Launcher select and launch Mocha
  • Make sure Don't relaunch OS is set to <on>
  • Press (A) and you will be booted back into the system menu
  • Start the mii maker (the browser exploit will have patched it temporarily and it will take you back to the Homebrew Launcher)
  • Launch ftpiiu_everywhere

Now it is time to dump the necessary files from your NAND through FTPiiU everywhere.

  • FTPiiU will tell you on which IP and port it is listening
  • Launch your favorite FTP client ( I recommend FileZilla )
  • Connect to your Wii U via the FTP client (in FileZilla that is File->Site Manager...->New Site and add the IP and port given by FTPiiU and press Connect)
  • You should see a bunch of folders, most of them called storage_something

'Download' the following files from your Wii U via the FTP client:

  • storage_mlc\sys\title\0005001b\10054000\content\ccerts\ (the entire ccerts folder
  • storage_mlc\sys\title\0005001b\10054000\content\scerts\ (the entire scerts folder
  • storage_mlc\usr\save\system\act\800000xx\account.dat

(You will likely have multiple 800000xx folders in storage_mlc\usr\save\system\act - potentially starting as low as 80000001 and having any range of numbering - inspect the account.dat with Wordpad or Notepad++ in each folder if you have multiple to find which one is the account.dat belonging to the account you want to use for Cemu, you will be able to tell by the AccountId field)

If you want to use the friend list app with Cemu to add or remove people you will also need to dump the following folder (depending on the region of your console the exact folder name will differ)

JP: storage_mlc\sys\title\00050030\1001500A

US: storage_mlc\sys\title\00050030\1001510A

EU: storage_mlc\sys\title\00050030\1001520A

Last but not least if you want Miis in games to have heads you will need to dump the following folder:


Now all the dumped files need to be copied to the Cemu folder keeping the exact folder structure from the Wii U intact with the exception that storage_mlc becomes just mlc01 (Cemu\mlc01).

For example: Cemu\mlc01\sys\title\0005001b\10054000\content\ccerts Cemu\mlc01\sys\title\0005001b\10054000\content\scerts

Right now Cemu only accepts the user 80000001 which means the account.dat has to go to Cemu\mlc01\usr\save\system\act\80000001\ no matter which numbering it originally had.

Lastly copy the otp.bin and seeprom.bin from your SD card into your Cemu folder (root directory where the Cemu.exe remains).

You should now be able to launch Cemu and "Enable online mode" under Options->Experimental If all the files are where they should be Cemu will display a warning message and ask for your confirmation.