The principles of androids are very fundamentally different from other systems. It's hard to explain linking data in Android so I won't even try.
By resetting the device you deleted the application system cache. All data links and connections have been deleted, and the storages names/references can be changed also....etc.
(The "ghosts" of previous installations can often appear, very strange, so ...)
In order for it to work properly after that, you must also delete the save folder. Of course you can back it up first in case you have some POIs saved, etc.
Or simply make a new clean package.

I would advise you to try another package to start with - for example PAL.

I can't remember on what topic your compatriots commented on the server settings for online services. I'll try to find out later if I have time.
Although I am from Europe and I tested earlier (with FakeGPS & VPN), I had no problems with default settings.

As for transfer cache from another device or from other software, a few files are simply copied from the save folder. A simple trick that, for example, files was transferred from Israel save to Avic and made weather forecast working.