This tutorial on how to root your phone using this flashable SuperSU Pro2.46 due to kingroot, framaroot and vroot are outdated esp. 64 bit processor running in Android Lollipop version this are apps that use for rooting. It’s more complicated and you need desktop or laptop and also custom recovery first to install this SuperSU . I don’t have the device but I believe it could be work in firefly mobile allure because this are tested in Ulefone Be Touch which rebranded by Firefly Allure 64 LTE and also tested in other device that running in Android Lollipop version.
Warning: Rooting can void your warranty. Do it at your own risk
1. Download SuperSUPro2.46 then put in your sdcard.
2. Go to your Recovery mode (Reboot your phone. Hold vol up+ Power button).
3. Mount system and Mount data
4. Go to install via zip. Then flash SuperSUPro2.46.