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

Panasonic Eluga X1 Pro Panasonic Eluga X1 Pro
Panasonic P90 Panasonic P90
Panasonic P95 Panasonic P95
Panasonic Eluga I7 Panasonic Eluga I7
Panasonic Eluga Ray 550 Panasonic Eluga Ray 550
Panasonic P101 Panasonic P101
Panasonic P100 Panasonic P100
Panasonic Eluga I9 Panasonic Eluga I9
Panasonic Eluga C Panasonic Eluga C
Panasonic P91 Panasonic P91
Panasonic Eluga I5 Panasonic Eluga I5
Panasonic Eluga A4 Panasonic Eluga A4
Panasonic P99 Panasonic P99
Panasonic Eluga I4 Panasonic Eluga I4
Panasonic Eluga Ray 500 Panasonic Eluga Ray 500
Panasonic Eluga Ray 700 Panasonic Eluga Ray 700
Panasonic P9 Panasonic P9
Panasonic Eluga I2 Activ Panasonic Eluga I2 Activ
Panasonic Eluga A3 Pro Panasonic Eluga A3 Pro
Panasonic Eluga A3 Panasonic Eluga A3