How do you update firmware on XA-NV300T?

ElDiablo12

I've got this add on, XA-NV300T, can someone tell me how to update the firmware on it? Which software does it use? Neither Tomtom home or connect recognise the device. I have taken the SD card out of it, plugged it into PC and the PC recognises it as "TOMTOM G:" and I can view the files on it, but still the software says no device connected, it is plugged directly into PC, not through a hub.
How do you actually update this device?

DougLap

HI @ElDiablo12

Any help here.

https://www.sony.co.uk/electronics/in-car-receivers-players-accessories/xa-nv300t

Doug

ElDiablo12

Thanks but I have already been through that page. That is the unit I've got, I contacted Sony support, they say the Tomtom SD card and firmware is Tomtom, not them.
I have also followed this page:
https://uk.support.tomtom.com/app/answers/detail/a_id/18390/~/downloading-and-installing-a-map-on-sony-xav
The last map update was over 2 years ago, February 2017.

DougLap

HI @ElDiablo12

Sorry I cannot help you any further if you have followed the instructions you have referred to as I am only a customer like you and I don't have that unit.. You have mentioned that the last update was in Feb 2017 is that from your existing map or from the fact that that is what is mentioned in the notes.

Don't know if the following Customer support will help. Don't detail model when asked and wait for someone to answer.

United Kingdom 02079 490 134

Monday - Friday: 9:00 a.m. to 5:30 p.m.

Doug

ElDiablo12

Thank you I'll try customer support next week.