LG security error fix f160 | F160 Lg fix | KDZ lg

Open kdz select downloaded firmware click normal flash. Put phone in download mode by pressing vol up home and power key, or turn off phone press vol up and vol down and plug cable. 
Now press START and RUN, Select Country and Language / Optional Clear Registry
Hit OK and just wait* (*don't close the program)
Phone will restart in Firmware Update and flash itself

best of luck no data lose just update firmware file which are broken during root or etc...

First download Firmware related to your model HERE

Download KDZ and Drivers HERE