How to force a factory reset or hard reset on Micromax devices

Micromax A85 Micromax A85
Micromax A55 Micromax A55
Micromax A75 Micromax A75
Micromax A73 Micromax A73
Micromax Funbook P300 Micromax Funbook P300
Micromax A78 Micromax A78
Micromax A50 Ninja Micromax A50 Ninja
Micromax A45 Micromax A45
Micromax A52 Micromax A52
Micromax A56 Micromax A56
Micromax A25 Micromax A25
Micromax Superfone Punk A44 Micromax Superfone Punk A44
Micromax A80 Micromax A80
Micromax A84 Micromax A84
Micromax A90 Micromax A90
Micromax A90s Micromax A90s
Micromax A100 Micromax A100
Micromax Funbook Pro Micromax Funbook Pro
Micromax Funbook Alfa P250 Micromax Funbook Alfa P250
Micromax Funbook Infinity P275 Micromax Funbook Infinity P275