Comment 77 for bug 1435040

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Simon Fels (morphis) wrote : Re: Ubuntu Phone (BQ E4.5) does not connect to car-bluetooth

Just add-apt-repository doesn't work as the priority of a silo is below the regular archive so those things aren't pulled in.

At best you use the citrain command line tool for this. However if you're installing a silo you will put your device into unsupported state and have to reflash to avoid any problems on OTA upgrade. See https://wiki.ubuntu.com/citrain/LandingProcess#Command-Line_Tool for how to install the citrain tool.

Then it is simple as this:

$ citrain device-upgrade 43 <your device pin>

Wait a bit and the device will go through a reboot.