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

Panasonic Eluga Tapp Panasonic Eluga Tapp
Panasonic P77 Panasonic P77
Panasonic P55 Novo Panasonic P55 Novo
Panasonic P88 Panasonic P88
Panasonic Eluga Pulse Panasonic Eluga Pulse
Panasonic Eluga Pulse X Panasonic Eluga Pulse X
Panasonic Eluga Ray Max Panasonic Eluga Ray Max
Panasonic Eluga Ray X Panasonic Eluga Ray X
Panasonic Eluga Mark 2 Panasonic Eluga Mark 2
Panasonic Eluga Ray Panasonic Eluga Ray
Panasonic P85 Panasonic P85
Panasonic Eluga i3 Mega Panasonic Eluga i3 Mega