Thanks for thew reply.
I have tried the normal USB in the computer and jack into the charging hole but the update wizard is telling me it can't find the USB device. I assume you need to remove the F5 unit from the helmet and then plug into the back of the unit rather than the charging plug. the problem is that the USB type connector in the f5 unit is an odd size and i have nothing that fits....before i scour the internet for an appropriate adapter i wanted to get a view from those who have updated the software how they have done it.
Cheers