I'm using Windows MMEX 1.4.0 and the latest Android app as well. For long time the database that run on PC could easily be opened on Android version (phone running Marshmallow).
Now that I changed to a new phone running Oreo (8.0.0) I'm not able to open the database anymore - the app is asking for a password that I never have set up.
How to fix that?

Even setting up completely new database does not work anymore.

Any ideas how to fix it?