A:AnswerI don't own a treadmill.
I believe you will be able to have success though.
I put a pretty "thick" protector on mine that actually has a kick-stand on the protector (that is a really nice option).
I think it would depend on how thick your treadmill tray/ledge is - they are all different.
I hope this was helpful. :)
A:AnswerWhen you check for software updates on the Tab A7,if it says Android 10 it prompts you to update and now you have Android 11.
I don't know about core . I don't know if it is helpful but the software information on my Galaxy Tab A7 says 'One UI Core Version" is 3.1