Could this have something to do with the problem we're seeing? https://github.com/ubports/ubuntu-touch/issues/1837 If so, it's not obvious to me there is a solution. @UniSuperBox posted "Funny enough, you can get another shell into the device in this state. Running sudo reboot there causes the Pixel 3a to boot into the selected mode, but the Volla Phone does not." but I don't know how to use this information to complete the install. BTW: I tried using UBports 0.8.8 ... but I ran into the same problem.