To ensure stability, always download the version specifically built for the Raspberry Pi 3 (Broadcom BCM2837 architecture) . Visit the Batocera Download Page and use the "rpi" filter to find the Raspberry Pi 3 model.
Attach a keyboard and press F1 on the Batocera main menu. This opens a Linux graphical file manager where you can drag files from a USB stick. Download Batocera 32gb Raspberry Pi 3
When you transfer ROMs via Wi-Fi or USB, you are writing to that hidden 29GB partition. You can verify available space by going to Main Menu > System Information in Batocera. This opens a Linux graphical file manager where
"Batocera Raspberry Pi 3 img.gz" or "Batocera 32gb image Pi 3 archive" "Batocera Raspberry Pi 3 img
shared in retro-gaming forums. However, the official image is always the starting point for a clean, personalized build.