G925A Unlock Error 6.0.1

Welcome to Octoplus/Octopus Box Samsung software version 2.4.7
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To connect SM-G925A 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: COM4
Selected model: SM-G925A
Reading info, please wait…
Please, press "OK" button on the phone to allow USB debugging..
Proper android device not found. Make shure that "USB debug" option
on the device is turned on.
Performed by 2.4.7 Software version.
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Platform: Samsung Android
Selected port: COM4
Selected model: SM-G925A
Reading info, please wait…
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-G925A
Firmware compiled date: Fri Oct 7 13:52:05 KST 2016
PDA version: G925AUCS5DPJ1
CSC version: G925AATT5DPJ1
SW version: G925AUCS5DPJ1
Phone SN: R38G40DNN9A
Android version: 6.0.1 (MMB29K)
Sales code: ATT
Country: USA
HW platform: exynos5
HW Chip: exynos7420
HW Modem: SHANNON333
Security patch level: 2016-10-01
Codename: zerolteuc
Performed by 2.4.7 Software version.

Platform: Samsung Android
Selected port: COM4
Selected model: SM-G925A
Searching for a phone. Please wait…
Found phone on COM214
Reading info…
Detected phone model:
HW Version: SM-G925AZKFATT
PDA version: G925AUCS5DPJ1
CSC version: G925AATT5DPJ1
CP version: G925AUCS5DPJ1
Phone SN: R38G40DNN9A
Phone IMEI: 357741-06-120088-5
Unlocking phone…
Fast Unlock method is not supported for current security settings in
your phone! Try to downgrade firmware!
Phone unlocking failed

Performed by 2.4.7 Software version.

Need Solution thnx