That is how you install and set up the PS3 emulation app. After it’s done installing, the RPCS3 app will auto-configure PPU Modules so let it happen. Open the RPCS3 app again and then select File->Install Firmware, this will open up a window from where you will have to locate the previously downloaded firmware file i.e.The downloaded file will be named PS3UPDAT.PUP. Download it with the browser on the Steam Deck. Visit the official PlayStation site to download the latest PS3 system software.This app will show an error of missing firmware. Once that is installed, you will press the Launch button where the install button was to start this app.Press the install button in the top right corner, and the app will be downloaded and installed on your device. Once in the Desktop Mode, you will go to the Discover Software Center and search for RPCS3.Press the Steam button, then go to Power and switch to Desktop Mode.You need to follow the steps below to install the RPCS3 app on your device: Installing And Initial Setup Of The RPCS3 App In Desktop Mode It looks like a lot of steps, but they’re surprisingly simple to follow. There are other things to tweak around which we will get into detail below. Simply put, to emulate PS3 on the Steam Deck you need to download and install the RPCS3 app and have a PS3 game in your storage to make it work.
