Good afternoon!
I may have found an issue with your Bolt IoT Setup app: this morning, it came into my mind that I still own an old Amazon Kindle FireHD device - thus, I charged it and gave it a try.
Outcome: the setup app seems to require a location service (why? I don’t see any reason for it) but my Kindle FireHD does not seem to have such - as a consequence, I got stuck when the app asked me to switch on a “high-accuracy location” or a “device-only location” service.
I.e., setup does not work on my Kindle FireHD either.