How to Flash Custom Rom in Lava Iris 820

Lava Iris 820 Nougat Custom Rom ViperOS 3.1.1 (Nougat 7.1.2) (MT6580)  Unofficial ViperOS ROM for Lava Iris 820 is  google

Lava iris 820 Nougat Custom ROM Lineage OS 14.1 Lineage OS 14.1 is a Nougat Custom ROM for Lava iris 820.

Lava Iris 820 Nougat Custom Rom dotOS 1.2 (Nougat 7.1) (MT6580) (Unofficial) (Bug Free)  dotOS 1.2 for Mediatek Mt6580 chipset

Lava Iris 820 Nougat Custom Rom AICP V12.1 (Nougat 7.1.2) (MT6580)  AICP rom V12.1 for Lava Iris 820 AICP rom. This rom

Lava Iris 820 Custom Rom MIUI 8 (Marshmallow 6.0.1) (MT6580)  MIUI 8 rom for MT6580 chipset based device is smooth and