@chris_db said in Retropie + Raspberry PI 3A+ = KO:

Can you point me to a working image for the 3A+?

There isn't other image - if the weekly snapshot images are not working for you, then try the official Raspbian Lite image and install RetroPie manually - https://retropie.org.uk/docs/Manual-Installation/. Does the official Raspbian image works on your 3A+ ?