The BLU Vivo 5R is an MT6753 powered phone running on Android 6 (Marshmallow) but upgradable to Android 7 (Nougat). If you've upgraded yours to Android 7 (Nougat) and wish to root, then follow the guide below
Copy the TWRP recovery.bin and scatter file from the TWRP zip file downloaded above into the Hovatek folder, making peloader.bin, scatter file and recovery.bin (TWRP) in the folder