Galaxy Tab A6 5.1 lollipop failed to write to ext sd card?

So I got my device a few days ago, and I thought the r/w on the ext sd was a kit kat problem.

There is not root for the galaxy tab A6 at the moment, so I can't do anything.

can someone point me to a right direction of enabling the r/w the ext sd card without root on 5.1? Thanks.