The update instructions in the app say I have to leave my phone/tablet on and close to my Joule for the duration of the update, which leads me to believe it's updating over bluetooth. So why does it then tell me I have to connect Joule to wi-fi to continue? I have no desire to put my Joule on the internet. I've seen enough security vulnerabilities in other appliances to be wary of putting anything on the internet unnecessarily.
Can't the update be done only over bluetooth? If not, why not? If it is done over bluetooth, why is wi-fi required? And if it's done over wi-fi, why does my tablet have to be on an in range?