Hello.
I saw that there were several requests to create a forum for Galaxy A3 / A5 / A7, but without success. Therefore, I create this topic here in the Alpha series.

How to root the Samsung Galaxy A5 (my variant is A500M duos brazilian) without changing the Knox counter.

Tutorial:

1) Enable USB debugging on developer settings.
2) Download the KingRoot 4.0 apk in the official site and install it. ( http://kingroot.net/root/ )
3) Connected on the Internet, open the app and click the blue button and wait until 100%.
4) Ready. Device with root and Knox 0x0 (valid warranty).

I hope this helps.

andreheitor