Can anyone assist with the Navman EZY270LMT device. Smart St Edition K

I had attempted to connect the Navman device to my pc so I can try and update the maps. It ha Australia Core Mapping 2012Q3
Core Mapping HERE 2014.05 / Safety Camera HERE 2014.05

The device had initially connected to my pc then kept on disconnecting. I had tried numerous occasions. My main pc is winows 10, then I tried to connect device to windows 8.1, had the same issue.

I downloaded NavDesk 7.50 to help with updating the device but could not do so as the GPS device kept disconnecting from the pc.

The device's battery is dead long time ago, whether this is the cause that's stopping the GPS maintaining connection with the pc, I would not know.

After removing the device from my pc and powering the gps device via external power supply. I get a complety different start screen.

I'd like to get this navman up and running correctly.

It's an old device and no longer has a subscription and I cant afford a new one being on a pension.

Any help would be appreciated.
Thanks