imao sam isti problem i čini se istog dana
na netu sam našao ovo :

How to do a factory reset on LG GM360 Steps:
Dial 1809#*360# on your LG GM360
You see "Factory mode" and "eng mode", choose "factory mode"
Scroll down and select "factory reset"
After the factory reset is complete, you must restart your phone for it to take full effect.

to sam i napravio i mob radi ko novi