Está en inglés pero se entiende bastante bien. Si necesitas traducción, sacaré un rato , pero básicamente dice que hay que descargar el archivo de la web de Mazda, guardarlo en la raíz del USB y desde gracenote (creo que está en configuración del vehículo) dar a actualizar y te lee el USB
Información sacada del mx30forum.com
A short video about Gracenote update in MX-30
GRACENOTE UPDATE PROCESS
1. Insert a USB drive into your computer.
2. Download the file: Gracenote_(version)_(region).mcg to the USB drive.
https://connect.mazda.com/en/support/...
Please ensure you have at least 1 GB of space remaining and the Gracenote_(version)_(region).mcg file is saved to the top level (root) of file folders on your USB drive.
3. When the download to the USB drive is complete, safely remove the USB drive from your computer and insert it into your vehicle's USB port.
4. Switch Power ON in the car.
5. Select "Settings" on the vehicle’s main display screen.
6. Scroll down and select "System Settings".
7. Select "Gracenote Database Update".
8. The system displays the version of the Music Update currently installed on your system. Select "Update". * The system shows the message: "Do you want to update the Gracenote Database to (version)?" This (version) is the current version of the Music Update installed on Mazda Connect.
9. The update may take several moments. Once completed, the system will display that the update was successful.
10. The USB drive can be safely removed from the vehicle port. You are ready.
https://en.wikipedia.org/wiki/Gracenote
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