The only way to fix a security error is to flash your LG G2 back to stock. Depending on what route you take, you can use a flash tool used by some developers, download the stock image and DLL file, the appropriate drivers for the LG G2 (depending on carrier), and use that flash tool to reinstall the phone's stock OS and drivers.
Try a hard reset.
ehat is reset code of lg gt505?
default password for Lg ku990
lg tu750 mack security code
1809#*500# to full factory reset your lg
3847
2945#*#
The last 4 digits of the phone number on the LG imprint
The default is 0000.
The LE error code on the LG washing machines usually means:faulty hall sensorfaulty stator assemblybad connection to hall sensor and/or stator assembly
0000 (By default)