I had issues with the update too. I've since learnt it's actually a USB micro (not a USB proprietary cable) that you can use to do this, however prior to learning that I eventually managed to get the update by putting the Kiox on the bike, ensuring my mobile phone was connected using Bosch app, going on a 40 to 50 min ride, leaving the Kiox ON, leaving my phone mounted on the bike, waiting for Kiox to shut down in its own time. My cell phone was left on data the whole time, not wireless. I did this over 2 days and when getting back on the bike later on the 2nd night, the Kiox asked me if I wanted to update! A bit inconsequential now, but being surprised that somehow this sequence of events worked I took a pic...