Hmmm, fallen at the first stage. I downloaded the USB flash drivers from the link (K770 ones) and unzipped them to a folder. I plugged the phone in holding down the C button and pointed Windows to the drivers, everything installed no problem.

When connecting in XS++ though, no joy. Then I saw in XS++ that the phone must be switched off when it is plugged in. So, I did it in that order and this time Windows was looking for something different, SEMC USB Flash driver. When I pointed Windows to the downloaded drivers though, Windows reports that they are no correct and I therefore just get an explanation mark in Device Manager.

Any thoughts as to why this is?