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

Micromax A104 Canvas Fire 2 Micromax A104 Canvas Fire 2
Micromax Canvas Hue Micromax Canvas Hue
Micromax Bolt A066 Micromax Bolt A066
Micromax Canvas Selfie A255 Micromax Canvas Selfie A255
Micromax Canvas Tab P470 Micromax Canvas Tab P470
Micromax Canvas Tab P666 Micromax Canvas Tab P666
Micromax Canvas Fire 4 A107 Micromax Canvas Fire 4 A107
Micromax A109 Canvas XL2 Micromax A109 Canvas XL2
Micromax Canvas 4 Plus A315 Micromax Canvas 4 Plus A315
Micromax Bolt A067 Micromax Bolt A067
Micromax Canvas Pep Q371 Micromax Canvas Pep Q371
Micromax Bolt A82 Micromax Bolt A82
Micromax Bolt Q324 Micromax Bolt Q324
Micromax Canvas Juice 2 AQ5001 Micromax Canvas Juice 2 AQ5001
Micromax Bolt D321 Micromax Bolt D321
Micromax Bolt D320 Micromax Bolt D320
Micromax Bolt S300 Micromax Bolt S300
Micromax Canvas Spark Q380 Micromax Canvas Spark Q380
Micromax Canvas Play Q355 Micromax Canvas Play Q355
Micromax Q372 Unite 3 Micromax Q372 Unite 3