If flashing your SD Card using RPI Imager, do not alter any settings or attempt to alter any WIFI settings through the RPI Imager options. Connect to your WIFI after flashing the image throught the Retropie menu
All images for the Zega Mame Boy Advance SP can be found on the Download area of the Mame Boy Advance page
Supported Devices
Raspberry Pi Zero
Raspberry Pi Zero 2