Summary
If your device has a community-supported bootloader, you are highly encouraged to ignore "one-click" applications and use modern, open-source rooting methods: kingroot android 5.1.1
Enable Developer Options: Go to Settings > About Phone and tap "Build Number" seven times. Deep analysis — KingRoot on Android 5
Suggested safer alternatives for Android 5.1.1: Warranty Voidance : Rooting your device may void
But freedom had a price. Without the manufacturer’s safe walls, strange things crawled in. A pop-up ad appeared, then a background service trying to mine crypto. A piece of malware knocked on the port: “Let me in. I’m a ‘battery optimizer.’”