The RT4 Device has optional USB Host Port.

On the back are 6 pins CD Changer connector, where 4 pins of them are a regular USB connection.

USB cable is available at Peugeot, the part number is 6574 JH and it costs around 20 euros.
You can also made own USB cable with own risk with this tutorial.

Without any modifications, the system accepts software/maps upgrades via the USB port, just like it was a CD-Rom disk.

Before RT4 read MP3 files directly from the USB device, you must enable it with Peugeot dealer or with using MiraScript

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