Online Play

If you need further help, ask on the official Cemu Discord Server for assistance.


In this section, we look at how to enable online play on Cemu. This involves dumping a set of online files from your Wii U to make Nintendo think that the connection from Cemu is actually coming from your console.

If you do not plan on using online services, we recommend you skip this section entirely to reduce the risk of a ban.

After we’ve dumped the online files, you’ll be able to play with other Wii U and Cemu players on Nintendo’s official game servers.

To do this, we’re going to need to use a custom homebrew application to dump console files. This is done using an exploit in the Wii U browser.

As we will be connecting to real Nintendo servers, do not:

  • Use mods, cheats or hacks
  • Play on both your console and Cemu at the same time
  • Share your online files for other people to use

Doing these may get your console banned, restricting you from online play.

Requirements

  • An SD card for homebrew

Downloads

If you set up homebrew before when using dumpling, you’ll only need to download wiiu-nanddumper.

Preparations

  1. Extract the mocha.zip file to the root of your SD card
    • If prompted to, replace any pre-existing files
  2. Extract the homebrew_launcher.v.1.4.zip file to the root of your SD card
  3. Copy the config.ini file to the /wiiu/apps/mocha folder on your SD card
  4. Copy the payload.elf file from the payload.zip file to the /wiiu folder on your SD card
  5. Extract the dumpling .zip file to the root of your SD card
  6. Extract the wiiu-nanddumper .zip file to the \wiiu\apps folder on your SD card
  7. Eject your SD card from Windows and put it into your Wii U console

Dumping Files

Opening the Homebrew Launcher

  1. Turn on your Wii U console
  2. Launch the internet browser and open wiiuexploit.xyz
  3. Tap Run Homebrew Launcher!
    • If your console freezes for more than 10 seconds, hold down the Power button for 4 seconds and reboot
    • Once rebooted, reset the browser’s save data and try again

Using nanddumper

  1. Run nanddumper.elf
  2. Set OTP (1KB) and SEEPROM (1KB) to <yes
  3. Set everything else to <no>
  4. Your Wii U will now reboot

Launching MochaCFW

  1. Open the Homebrew Launcher as mentioned previously
  2. Once in the Homebrew Launcher, launch MochaCFW
    • This should return you back to the Homebrew Launcher, where we will now launch dumpling

Using dumpling

  1. Run the dumpling app from the Homebrew Launcher
  2. Select Account Data using the (A) button
    • If you did this before while dumping games, this isn’t necessary
  3. Select Friends List using the (A) button
  4. Press (START) to begin dumping
  5. Press the Home button to exit and then turn off your Wii U

Copying to Cemu

  1. Take your SD card out of your Wii U and put it in your PC
  2. Copy otp.bin and seeprom.bin from the root of your SD card to your Cemu directory
    • This is where Cemu.exe is located
  3. Copy the contents of dumpling/account_data/mlc01 to your Cemu mlc01 folder
    • Overwrite any files if prompted
  4. Copy the dumpling/friends_list_xx folder to your Cemu games directory
    • xx will vary depending on your region

Selecting your Account

  1. Open the Cemu emulator
  2. On the top bar, go to Options -> General Settings
  3. Navigate to the Account tab
  4. Ensure your active account is set to the account you use on your Wii U
  5. Check the box Enable online mode

Your Wii U should now be ready to go online. If you ever want to disable online features, simply uncheck the box Enable online mode.

Continue to Optimizing Cemu