J510F FRP can’t be removed by any method

I received J510F on FRP locked ,
Latest edition method works till rootjunky.apk installed when I run rootjunky.apk
Error comes unfortunately has stopped . When I run quickshortcut.apk
There is no email password option in google account manager .
Security patch 10 Aug .
I tried 20 time hard reset every trick available on net not working
My question is that installed firmware date is 01-05-2016 on sammonile
Secateurs patch date is 01-08-2016
If I flash firmware phone will it downgrade security patch ?