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

LG Risio 3 LG Risio 3
LG Premier Pro LTE LG Premier Pro LTE
LG Q7 MT6750S LG Q7 MT6750S
LG Q7+ LG Q7+
LG X2 (2018) LG X2 (2018)
LG X5 (2018) LG X5 (2018)
LG Q Stylus+ LG Q Stylus+
LG Q7+ MT6750S LG Q7+ MT6750S
LG Aristo 2 Plus LG Aristo 2 Plus
LG Stylo 4 LG Stylo 4
LG Phoenix Plus LG Phoenix Plus
LG X Power 3 LG X Power 3
LG K11 Alpha LG K11 Alpha
LG Signature Edition 2018 LG Signature Edition 2018
LG Harmony 2 LG Harmony 2
LG Q Stylo+ LG Q Stylo+
LG Q8 (2018) LG Q8 (2018)
LG G7+ ThinQ LG G7+ ThinQ
LG Stylo 4 Plus LG Stylo 4 Plus
LG Rebel 4 LG Rebel 4