Does anyone or has anyone updated the radio firmware via the SD card slot, is it possible to download the latest firmware version, I am having issues with the Media device not connecting, I have updated and the MDI has the most recent firmware, but I think the head unit is on an older version.

I didn't realise the mdi had a separate way of being updated!

The only way to update the Bolero is via a dealer visit.

MDI can be updated via a USB stick in the appropriate connector.

The 'My GTi' website has the firmware.

Bolero firmware is not available outside of the dealer AFAIK.