> I will write results here. I think it will be interesting for someone.

So, this is the result:

1. We've made "Market-like" architecture: "Installer" and "Updater".
2. "Installer" has system permissions to install packages and reboot
device. It does only one work - installing prepared package and
rebooting device if it need.
3. "Updater" has no special permissions. It just connects to server
and gets needed packages according to its settings. And then it calls
"Installer".
4. We've talked with vendor and recieved agree to make special
firmware with integrated "Installer" and "Updater".


"Installer" is separate package because of "Updater" can't update
itself. But we want to have ability to change update logic.

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