You have to specify one thing, and that is that the application is only to get Root in the Samsung Galaxy S4 Active, in the Samsung Stock ROM with which it arrives. This means that if you have the smartphone from the South Korean company, you will only get access with Superuser permissions, this will not work to unlock the Bootloader, although it is the first thing that must be done to install new ROMs, uninstall applications that come pre-installed and cannot be removed, or terminate operator customization.
As you know, the Root processes usually use an exploit that is based on a system error, which allows obtaining Superuser permissions on the smartphone itself. It should also be clarified that these processes can be harmful, and could cause errors on the smartphone. It is not common, and more with high-level developers, that the smartphone is unusable, but in any case we must warn it.
To get root the Samsung Galaxy S4 Active all you have to do is install the app, run it, and allow the relevant exploits to run. From the application itself we are given the possibility of making donations. To download it, we just have to access the developer’s website, who has enabled a specific section for the application, and you can find the link at the end of the post. Remember, of course, that in order to install the application it will be necessary to have the Unknown Sources option active, found in Settings> Developer options.