If your phone Samsung j710f have problem like wifi or bluetooth problem you can sort out easily with the help of this solution.
Problems: Wifi not work, bluetooth not work, hang or restart problem, some time it shows error during connectivity of wifi.
Solution: When you faces these types of problem in j710f just flash with this flash file.
Download flash file: Download
After the flash with this file you can easily recover the phone and sort out whole types of problem which you faces in phone.
Sometimes these fault creates during flashing or updating the phone, so use this flash file to recover it.