How to root Samsung Galaxy S5 Active SM-G870A
Download Root File Full Pack
1. NG3 OTA update if Need
2. Download and install Towelroot-v3.apk (this version does not require internet access).
3. Place “Download Mode” (press and hold the Home+Volume Down+Power keys until the phone powers on and displays warning screen, then press Volume Up key) and flash the Sam Root NE4_Stock_Kernel using Odin’s PDA slot (AP in Odin v3.09 or v3.09+).
4. Open the Towelroot app from your app drawer and press “Make it Rain” to root your device.
5. Power off “Download Mode” again and flash the Sam Root NG3_Stock_Kernel also in Odin’s PDA slot (AP in Odin v3.09 or v3.09+).
6. Download SuperSu and install then manage to root access. Done!
How download this file see this video click here