Samsung SM-J710F Reset FRP successfully done 2.6.4 Software version.

7. Reset FRP/Reactivation Lock

Method 1. Via UART (EMMC memory chip)

1. Click "Reset FRP/Reactivation" button.
2. Connect the phone to Box via Samsung Micro UART cable.
3. Press and hold "Vol-" and "Power" buttons for 15-20 seconds.
4. Wait until the software will ask you to connect Micro USB cable.
5. Connect the phone to PC via Micro USB cable. Software will read some data.
6. Connect again the phone to Box via Samsung Micro UART cable.
7. Press and hold "Vol-" and "Power" buttons for 15-20 seconds.
8. Follow software instructions (prompts).

Method 2. Via ADB (Combination)

1. Enable ADB by writing boot.img partition from combination firmware
2. Click "Reset FRP" button.
3. Connect the phone to PC via Micro USB cable.
4. Follow software instructions (prompts).

To Enable ADB You can try to do the following:

1. Write full combination firmware.
2. Enable ADB from settings
3. Write stock firmware without "recovery.img", "cache.img", and "userdata" partitions.

Method 3. Via ADB (ENG root)

1. Enable ADB and Root then phone by writing boot partition from engineering firmware
2. Click "Reset FRP / Reactivation" button.
3. Connect the phone to PC via Micro USB cable.
4. Follow software instructions (prompts).
5.  Platform: Samsung Android
   Selected port: COM1
   Selected model: SM-J710F
   Searching for a phone (waiting for ADB device)...
   Reading info...
   Detected phone model: SM-J710F
   Firmware compiled date: Tue Jul 25 17:37:47 KST 2017
   PDA version: J710FXXS3AQG1
   CSC version: J710FOJV2AQB2
   SW version: J710FXXS3AQH1
   Phone SN: RF8H536WYTT
   Android version: 6.0.1 (MMB29K)
   Sales code: PAK
   Country: PAKISTAN
   HW platform: exynos5
   HW Chip: exynos7870
   HW Modem: SHANNON315
   Security patch level: 2017-07-01
   SIM 1 status: absent
   SIM 2 status: absent
   Codename: j7xeltexx
   Resetting FRP lock..
   FRP lock is successfully reseted!
   Goto "Menu->Settings->Backup and reset" and make "Factory data reset"
   Performed by 2.6.4 Software version.