the screen is glued down with a silicone flexible type glue on a 1mm or less edge, that you need to loosen with a hot air soldering blower. make sure the temperature does not get too high that you burn or melt the plastic clips that connect the bands.

I expect to replace the screen again if I ever need to replace the battery, because it will probably crack as i try to pry it out

This Fitbit had a very cracked screen, which was extremely handy for finding leverage to take out the screen.