sm-j710fn 7.0 ime repare......
 

Waiting ADB device... Ok
Reading phone info...
Model: SM-J710F
Android version: 7.0
Product code: SM-J710FZDUINS
Phone version: J710FXXU4BRA2
PDA version: J710FXXU4BRA1
CSC version: J710FODD4BRA1
CSC country code: India
CSC sales code: INS
HW version: MP 0.300
Phone SN: RZ8H91LPXAF
Chip name: EXYNOS7870
Modem board: SHANNON315
RF cal date: 20160924
IMEI:
Checking Super user right... true
Reading NV data... Ok
Checking NV data... Ok
Initialization zTool... Ok
Running zTool, please wait...
Start... Ok
Initialization... Ok
Generate and check client proof... Ok
Verify proof by client... Ok
Reading data from phone... error (0)
Try downgrade modem if possible
Done with Samsung Tool PRO v.27.4

at first try same operation with last version samsung too PRO if you problem is no solve

flash with version Marshmallow 6.0.1 and try same operation repaire

you can download here