What to do if Johannus Musical Instrument displays error USB code 3?
- KKent BrooksAug 5, 2025
If your Johannus Musical Instrument displays the error message 'Error: Usb code 3', it indicates that the USB stick is not formatted correctly or is too large. Ensure that the USB stick is formatted with the FAT32 file system and has a storage size of 32GB or less. Store your data on a correctly formatted USB stick.