I uninstalled and reinstalled BRouter for the latest 1.5.5 version, and used the new default location of /Android/data/btools.routingapp/files/brouter for profiles and segments. I then went into Settings / Navigation in Locus, changed navigation data source to BRouter, tapped on the three line menu at the right-hand side of the navigation data source option, tapped on the wrench icon, and activated Advanced settings. If you do that you will then find that you can tap on the "ROUTING PROFILE" dropdown arrow, and the BRouter profiles you have in /Android/data/btools.routingapp/files/brouter/profiles2 will appear in the list below the Locus profiles and can be selected.