Wiki/wiki-rtd/docs/wiki_emulator_guides/cemu/cemu-guide.md

Cemu - General Guide

Cemu Links:

Cemu Compatibility Guide

Cemu Wiki

Cemu Github

Cemu Webpage

Where to put the games?

WiiU games should be put under the retrodeck/roms/wiiu/ directory.

What file formats are supported?

Encrypted formats:

.wud 
.wux 

Decrypted formats

.wua 
.rpx 

Note:

.wua is the preferred format to use for Wii U games.

Does Cemu require BIOS or Firmware?

Yes, keys.txt if the file format is encrypted.

otp.bin and seeprom.bin if you want to play Online.

Where to put the BIOS / Firmware files?

~/.var/app/net.retrodeck.retrodeck/data/Cemu

This will be changed in a later update to the retrodeck/bios/cemu folder.

Folder structure

Type	Folder	Emulator Folder	Comment
Saves Folder	retrodeck/saves/wiiu/cemu/
Config Folder	~/.var/app/net.retrodeck.retrodeck/config/Cemu/	settings.xml, gameProfiles folder, controllerProfiles folder
BIOS Folder	retrodeck/bios/Cemu	Contains usr and sys folders
Data folder	~/.var/app/org.retrodeck.retrodeck/data/Cemu

Guide - How to install DLC and Updates

NOTE:

Do not keep DLC and Update files in: retrodeck/roms/wiiu/

Instructions:

1. Open the Configurator and Open Cemu
2. Press File -> Install game title, update, or DLC...
3. Navigate to where you have your files.
4. Choose the DLC or Update file and press Open and it will install.
5. Repeat for each DLC / Update you want to install.

Guide - How make .wua files and install the games

NOTE:

• Encrypted ROMs can't be converted to .wua.
• Before you make the .wua install any updates or DLC first to the base game.

Instructions:

1. Open the Configurator and Open Cemu
2. Press Tools -> Title Manager
3. Search for the game you want to convert and check so the Type colum says: base.
4. Right click and press the Convert to compressed Wii U archive.
5. Verify in the prompt that everything you want is there: base game, updates and DLC.
6. Select the output target folder: retrodeck/roms/wiiu/.

Pretendo Account for online play

To create a Pretendo Network account use the following link: Pretendo: Register Account.

Then follow the following link: Pretendo: Install WiiU to log in with your Pretendo Network account on a Wii U.

• Existing NNID are not usable on Pretendo Network, you must create a Pretendo account for Pretendo Network.

Follow the Cemu: Online Play Guide to generate and dump the required user files for your Pretendo Account.

RetroDECK specific file locations:

• Wii U User Account’s usr and sys folders

  • Whatever MLC Path in Options -> General settings is configured to
  • by default it’s retrodeck/bios/cemu

• otp.bin and seeprom.bin

  • ~/.var/app/org.retrodeck.retrodeck/data/Cemu

Known issues

Certain Cemu UI elements are cramped in Steam Deck - Game Mode

If you are trying to change settings in Cemu on a Steam Deck in Game Mode, some UI elements might be cramped or the buttons are outside of the screen.

This has to do with resolution scaling of the Cemu application and the Steam Deck's resolution, to solve it you can temporally increase the resolution in Steam of RetroDECK:

1. Exit RetroDECK.
2. Go to RetroDECK in Steam.
3. Click on the ⚙️ icon - Properties - Shortcut - Game Resolution
4. Set the Resolution from Default to 1920x1080
5. Also turn on Set resolution for internal and external display (this might be hidden sometimes just go back one menu and go in again to make it show up).
6. Open Configurator - Cemu
7. Make the changes you want and save.
8. Exit RetroDECK and revert the display changes.
9. Click on the ⚙️ icon - Properties - Shortcut - Game Resolution.
10. Set the Resolution from 1920x1080 to Default.