CEMU: How to Play Online?!

So the new CEMU version is out but you might have several questions and I’m here to answer them all!  I guess I start with the most asked question on the internet. How the hell can I play Online while using CEMU?

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Picture: YouTube

Requirements

  • Wii U
  • A regular SD card (or mini/micro with an adapter) of virtually any capacity
  • 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)
  • 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, read here.

The SD card part

  • If your SD card is formatted correctly it is time to copy the necessary files to it.
  • I recommend downloading the prepared zip file. It pulls almost all the required tools from their official sources and neatly packs them into an 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.
  • You will also need to download ftpiiuu everywhere and copy the ftpiiu_everywhere.elf to your SD card. Into wiiu\apps\ftpiiu_everywhere\ – you need to create that last folder!

Homebrew Launcher

If your Wii U is running on system update 5.5.2 (newest as of November 2017) the browser exploit might require many tries to get to work. If you don’t own any of these 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. The cheapest are Brain Age (USA) or Dr. Kawashima’s Brain Training (EUR) at around $7 which can be purchased and downloaded in the eShop app.

System Update 5.5.2

  • 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 http://u.drg.li (it is recommended that you bookmark this url since you might need to try this a couple of times)!
  • Press the “Exploit” button 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, I had most success with the exploit number “3” – but you might have to try any variation of those options for it to finally work, resetting the browser save data after every attempt might aid this process
  • You can also click “Go here if you want to try a new faster version” and give that a shot, it is supposed to work better for some people.

System Update 5.5.1 & 5.5.0

  • Make sure the Wii U is turned off and insert the SD card you have prepared on your PC
  • Boot up the Wii U and launch the browser app
  • Go into the browser settings and choose “Reset save data”
  • Open the URL http://loadiine.ovh (it is recommended that you bookmark this url since you might need to try this a couple of times)
  • Make sure “Homebrew Launcher 1.4 (5.5.0 – 5.5.1)” is selected and submit
  • 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)

Haxchi on top of your DS VC game

Skip this if you don’t own any of the DS VC titles listed 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 you’re in the Homebrew Channel, launch the nanddumper app.
  • Make sure only OTP (1KB) and SEEPROM (1KB) are set to <yes> as these are the only things we want to dump with the nanddumper.
  • 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 2
  • Once you are back in the Homebrew Launcher select and launch Mocha
  • Make sure “Don’t relaunch OS” is set to
  • 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

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 such as Filezilla or FlashFXP.
  • 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 sets of files from your Wii U via the FTP client
  • storage_mlc\sys\title\0005001b\10054000\content\ccerts\WIIU_ACCOUNT_1_CERT.de
  • storage_mlc\sys\title\0005001b\10054000\content\ccerts\WIIU_ACCOUNT_1_RSA_KEY.aes
  • storage_mlc\sys\title\0005001b\10054000\content\scerts\CACERT_NINTENDO_CA_G3.der
  • 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)

Splatoon online 

You will also need to launch Splatoon on your Wii U first and ‘download’ the following folder with the FTP client

storage_mlc\usr\boss\0050000\10176a00 (or 10176900 if Splatoon US)

Note: The Splatoon related files have to be re-dumped once every month since they contain the current map rotation. If you end up finding only empty lobbies you should compare your game’s current maps with this twitter feed. If they don’t match it’s time to dump these files again.

It’s complicated give me a video!

Okay these are the most two important videos to setupo the emulator and your controller. I hope it helps you!

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