Thanks for this. I plowed through your list (very clear and concise; you could be a tech writer!) and checked everything. Only two questions:

@robrio said in Change my country:

Clear location data: Go to your Opera settings and clear your browser’s cache and cookies, which might be storing outdated location data.

Double checking: In Android, that's Clear Data, correct? (It's in Privacy and Security, and separate from Cookies.)

I'll try data clearing first as removing Cookies will take a longer recovery (passwords, etc.).

@robrio said in Change my country:

GPS-based location: Try enabling GPS on your device while using Opera, as it might rely on Wi-Fi-based location, which can be inaccurate.

I couldn't find any GPS in Android's Settings; the only thing close is Location, which is set to allow in Opera (precise location) only while using the app.