frp error

Welcome to Octoplus Box Samsung software version 2.6.9
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To connect SM-J710F phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
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Platform: Samsung Android
Selected port: COM3
Selected model: SM-J710F
Operation: Reset FRP - UART EMMC
Searching for UART interface.. COM4
Connect Samsung Micro UART cable(with 525K resistor), press and
hold "Vol-" + "Power" buttons for 15-20 seconds
Searching for device. Please wait...
Phone found.
Rebooting phone in Upload Mode...OK
Please connect phone to USB cable..
Searching for a phone. Please wait...OK
Reading data...
Checking operation...OK
Searching for UART interface.. COM4
Connect Samsung Micro UART cable(with 525K resistor), press and
hold "Vol-" + "Power" buttons for 15-20 seconds
Searching for device. Please wait...
Phone found.
Resetting FRP lock (1/4 attempt)..unsuccessful
Searching for UART interface.. COM4
Connect Samsung Micro UART cable(with 525K resistor), press and
hold "Vol-" + "Power" buttons for 15-20 seconds
Searching for device. Please wait...
Phone found.
Resetting FRP lock (2/4 attempt)..unsuccessful
Searching for UART interface.. COM4
Connect Samsung Micro UART cable(with 525K resistor), press and
hold "Vol-" + "Power" buttons for 15-20 seconds
Searching for device. Please wait...
Phone found.
Resetting FRP lock (3/4 attempt)..