Wyciągnąłem z Service Bulletin info jak zrobić hard reset/factory reset w różnych modelach LG

LG P920 - Volume Down + 3D Key+ Power Key and then you have to Selected Factory Reset
LG P990 - Power + volume down (for over 10 seconds)
LG P970 - NA (Phone spec. limitation)
LG P500 - Power + Home + Down volume (for 10 seconds)
LG P350 - SEND + END + Volume Down for over 10 seconds
LG V901 - Volume Down+ Power On key (More than 5 sec )
LG C550 - Volume Down + End + Send (Power) (for 10 seconds)
LG C660 - Volume Down key + Home key + Power key (for 10 seconds)
LG P690/692 - Volume Down key + Home key + Power key (for 10 seconds)
LG P940 - Power/Lock key + Camera Key + Volume Down Key (for 10 seconds)

Dzięki za pomoc. Muszę to zrobić, bo mi się coraz bardziej wiesza telefon...