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For those of you who want root on your Samsung Galaxy S4 Active, here’s an easy way to do it.
Before we begin, this root method is for the latest firmware ending in UCUAMF3 (check this under Settings->About device). If you have a newer firmware, this root method may or may not work (I have no way to tell since I don’t have a time machine.) but should be safe to do.
To root your Samsung Galaxy S4 Active, simply download the APK file geohot.com/activeroot and install the app.
Once that app has been installed, simply open the app and your phone should have root. Now, this will install the root/SU binaries, you still need to download and install SuperSU app from Play Store to get full root acess to your apps.
So, go ahead and download the latest SuperSU app and when it asks you to update binaries, simply do so and you should have a 100% rooted Galaxy S4 Active.
Now, once rooted, you will get a bunch of security warnings, simply use ES File Explorer to rename KNOXAgent.apk and KNOXAgent.odex to KNOXAgent.apk2 and KNOXAgent.odex2. (See video tutorial above if you don’t know how to do this or having trouble.)
What is a Custom ROM?
A custom ROM is a custom, modified operating system that you can install on your Android device. Basically it's like installing Windows OS on a Macbook. By installing a custom ROM, you can bypass stock factory settings like locked hotspot tether, install new Android versions early, or even convert your phone into another OS.
With a custom ROM, you can really maximize the capabilities of your smartphone by adding custom features that have been developed by open source developers.
How to Install Custom ROMs
First, you will need to root your device, if it is not rooted yet, follow our root tutorial and root your phone.
Once rooted, you should have TWRP installed on your phone. Installation of a custom ROM is easy if you learn the basic of it. If you don't know how to install custom ROMs using TWRP recovery, see our tutorial on How to Install Custom ROM using TWRP!