I just almost made a tutorial on how to sideload apps. And as I was starting it, showing what’s wrong, it worked!
Only difference is that I had sideloaded one simple app, and the whole thing righted itself after a few hours.
To sideload, you go, in a browser, to the Pebble Web site. Find an app you like. I do not think you need to log in, but it will tell you. Add the app. It will work.
And then try to do another app through the regular store. You might say that I accidentally “Kickstarted” it. (Very bad analogy.)
It’s working fine again. Maybe I WILL get the $50 spare Time, and the pretty little 14" band Round for events and dinner and so forth. I was convinced it was all done for.
No promises! And I’m Android KitKat 4.4.4 which was the last bulletproof OS from Google. (But my phone is just too old and I’m getting the Note 8. WITH PEBBLE!
I hope this helps. Sideload anything and then go back to the official app. It should work. Let me know. I am watching this topic. Good luck!