i have 3 sd cards that i use,  they all are HD20 images and i use them with the floppy emu… 

7.1

6.0.8

and i forget the other os i use for the 128k / 512k

and yup there are app's the don't run 7+

some good apps too.

there is one really cool app i like its called Music Works.

https://goo.gl/photos/oauNguTJzNdV6qgm8