Install RetroArch
First study the “About RetroArch” section and decide which version of RetroArch you want to use. Download the APK and transfer it to the SHIELD.

Install RetroArch and run it once. And if you are not using my version of RetroArch also download the emulator cores you need:

On your PC download these configuration files:
http://lindqvist.synology.me/shieldguide/retroarch.cfg
http://lindqvist.synology.me/shieldguide/retroarch-core-options.cfg

Upload them to the RetroArch data folder on the SHIELD (overwrite existing files):

Create the folder structure for the games
These folders are case sensitive and they need to be named exactly like shown in order for Advanced Launcher to work. Start by creating a “Roms” folder in the root of your storage on the Shield:

Then create these directories inside the “Roms” folder: