Samsung A310F/A3 2016 android 7.0 FRP solution
First download combination file and extract it.
Put your phone in to the download mode (volume down+home+power key at the same time after power on press volume up key).
Download latest Odin and open.
Select combination file on AP option. Then flash it.
Wait for complete and wit for reboot mobile.
After complete power on your phone go to setting>about device>built number (tap 7 times for USB debugging).
Go back, open USB debugging and just power off your phone.
Download latest Firmware and extract.
Once again put your phone in download mode.
Browser firmware in Odin and press start option. Wait for complete.
After power on phone setup without gmail Id.
Its a tested solution 100%.