Default [Q] F320K (LG G2) some problem is appeard after Flash rom

How can i recovery the Original ROM? I tried the online method, but the following problems occur.

1: show the sercurity error
2. can not go flash rom mode (just appear some koeran)
3. tried use the flashtool, but it doesn't work too, (appear Page error)

Now, my phone can not work, can not load the system