When using a USB drive, the display reads: “USB ERR” or “READING”, then switches back to radio.

Possible Cause: Invalid media or device.

Action: RetroSound^® radios will playback Mp3, WMA, or FLAC files via a flash drive. Only Motors 4 and 6 will read from Apple devices. No other devices are supported. Also make sure USB Drive is formatted FAT32 and has no folders or other files.