Just received my Argon and Xenon mesh devices.
Trying to setup these devices out of the box using the android app, and they all stop during the mandatory firmware upgrade, somewhere around the 12-15% mark.
The magenta flashing during the firmware update stops and after some timeout the device reverts to flashing blue, and the application just sits there without making forward progress.
This looks different from the other failure modes I can find here in the forums.
Happens to all of my devices, Argon and Xenon, they all fail the same way with minor differences in the percentage progress before failure.
I just updated the app to 2.3.6 (27 Nov 2018), running on an LG G5 running Android 7.0.