Very odd Dave because I did just that, I thought oh I know how to do this I've set up so many BT pieces of equipment before that I put the instruction booklet to one side and tried in the usual way to set up a piece of BT, I found that I could pair it with the phone alright but the victron app would then not find it, I have to say that I nearly gave up and thought that the software of the victron was corrupt or not there or not compatiblewith my particular phone, it was then I decided to look at the instructions and realised that although you are using your phone as a BT host you are actually pairing with the Victron app as such and not the phone, the software is on the Victron kit not in the app, the app is just a means of communicating with the Victron article of what ever type charger/solar. It was only then that I could get the app to work by following the instructions, my wife used to come to me with various problems of bought tech saying it's not working and I would say to her "Have you read the instructions " "No " she would say and when she did the problem invariably went away, I should in this case have followed my own advice in the first place rather than spend a frustrating hour or so checking signal strength, internet connections and electrical connections. By the way Raw to update you have to have a really strong internet connection be it wireless or phone supplied if you don't have a really strong connection it will not update, that's something else I realised after I had connected the app, I would think this is down to the Victron software not allowing an update unless the signal strength of the internet is good enough not to be lost during updating and corrupting the update. Phil