Since you cannot plug the CD-S303 into a computer, updating requires a provided by Yamaha. Here is the legitimate process.

Warning: Do not turn off the power during the update, as this may damage the unit. Auto-Restart : The unit will automatically restart once finished. Troubleshooting

A USB stick (formatted to FAT16 or FAT32) to transfer the file. Computer: To download the firmware file.

Ensures smooth playback when reading high-resolution MP3, WMA, LPCM, AAC, or FLAC files from the front USB port. Phase 1: Check Your Current Firmware Version

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Yamaha Cd S303 Firmware Update ((better)) →

Since you cannot plug the CD-S303 into a computer, updating requires a provided by Yamaha. Here is the legitimate process.

Warning: Do not turn off the power during the update, as this may damage the unit. Auto-Restart : The unit will automatically restart once finished. Troubleshooting Yamaha Cd S303 Firmware Update

A USB stick (formatted to FAT16 or FAT32) to transfer the file. Computer: To download the firmware file. Since you cannot plug the CD-S303 into a

Ensures smooth playback when reading high-resolution MP3, WMA, LPCM, AAC, or FLAC files from the front USB port. Phase 1: Check Your Current Firmware Version Yamaha Cd S303 Firmware Update