I just learned something new, i tried updating on mine and it kept disconnected right before I would start the update process.
I dont know if this works for Apple phones but I have an android and I realized that you have to uncheck the option: "Disconnect on backgroup".
The actual process of downloading the firmware file into your phone you need to follow the process within the app.
See the latest video showing how updates work now?
Burger Motorsports
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