Cut the frame and paste in place: it will become the last created.
Thank you, jmlevy, this works!
But when dealing with an object with many pages, this can be tedious, though. So, is there another way? Is there a way to change the text frame order by e.g. entering a new value for its number somewhere within InDesign?
I don't think so. May be with a third-party plugin, or a script?
But if a script was able to address a text frame, how would a script differentiate between various frames? A unique number is very likely to exist in ID for every frame in my opinion.
Any script master minds in the house?