samsung a310f frp remove done z3x 1000%

step 1 download this firmware if see this sceenshot after flash and complete factory reset hard reset
step 2 download sidesync here install it launced sidesync
open your phone normal mode and connect wifi and plugusb  after see browser option choice defult browser and download es file explorer complete install open it
step 3 download samsung bypass apk here copy to mmc card  and get plug in otg cable install samsung bypass apk open and go to setting menu about device build number click 5-7 get developer option

 open oem unlock select usb debugging 

 and finale step disconnect otg connect usb cable and oepn z3x tool pro 

reset frp almost done tested me