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

LG X Charge LG X Charge
LG X Charge M322 LG X Charge M322
LG G Pad IV 8.0 FHD LTE LG G Pad IV 8.0 FHD LTE
LG Q6+ LG Q6+
LG G Pad X2 8.0 Plus LG G Pad X2 8.0 Plus
LG V30+ LG V30+
LG K7i Mosquito Away LG K7i Mosquito Away
LG LS7 4G LTE LG LS7 4G LTE
LG G Pad F2 8.0 LG G Pad F2 8.0
LG Signature Edition LG Signature Edition
LG Tribute Dynasty LG Tribute Dynasty
LG Rebel 3 LG Rebel 3
LG K10+ (2018) LG K10+ (2018)
LG V30S ThniQ LG V30S ThniQ
LG V30S+ ThniQ LG V30S+ ThniQ
LG X4 LG X4
LG K9 LG K9
LG K8+ (2018) LG K8+ (2018)
LG Fortune 2 LG Fortune 2
LG K11 LG K11