g935a unlock error

Welcome to Octoplus Box Samsung software version 2.8.1
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Connecting to server...
Username: headszone18
Authorizing...
Checking balance...
Your balance: 50 credits.
Performed by 2.8.1 Software version.
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Platform: Samsung Android
Selected port: COM12
Selected model: SM-G935A
Operation: Read Codes
"Devices with Unlock App (branded to T-Mobile, MetroPCS, etc.) are not
supported!

Make sure device requests to enter unlock code and only then perform
“Read Codes” operation!"

Continue?
Searching for a phone. Please wait...
Please, press "OK" button on the phone to allow USB debugging.
Detected phone model: SM-G935A
Firmware compiled date: Mon Aug 14 12:23:42 KST 2017
PDA version: G935AUCS4BQH1
CSC version: G935AATT4BQH1
SW version: G935AUCS4BQH1
Phone SN: RF8HA050T2P
Android version: 7.0 (NRD90M)
Sales code: ATT
Country: USA
HW platform: msm8996
HW Chip: MSM8996
HW Modem: MSM8996
Security patch level: 2017-08-01
Warranty Void: 0
SIM 1 status: network locked
Codename: hero2qlteuc
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Connecting to server ..
Username: headszone18
Connect to server successfull.
Checking smart card...
Smart card successfully checked.
Your balance: 50 credits.
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Rebooting phone
Searching for a phone. Please wait...OK
Rebooting phone
Searching for a phone. Please wait...OK
Rebooting phone in Upload Mode...
Searching for a phone. Please wait...OK
Reading data...OK
Detecting security type...(0)
Searching for signatures...OK
Sending request...
Performed by 2.8.1 Software version.
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Connecting to server...
Username: headszone18
Authorizing...
Checking balance...
Your balance: 50 credits.
Performed by 2.8.1 Software version.
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Platform: Samsung Android
Selected port: COM12
Selected model: SM-G550T1
Operation: Reset FRP - UserData
Reset FRP/ Reactivation lock operation for SM-G550T1 will delete all
user data on the phone (contacts, pictures and others)!

NOTE: You can reset FRP/ Reactivation without losing user data via
Factory Reset FRP/ Reactivation service.
Connecting to server...
Connecting to server...Ok!
Checking resource files...
Resource files already downloaded.
Please put the phone into Download Mode and connect USB cable.
To put SM-G550T1 into Download Mode, You have to perform the
following steps:
1. Reconnect the battery.
2. Press and hold "Volume-" + "Home" + "Power ON" keys.
3. When phone turns on, press "Volume+" key.
Waiting for phone...
Operation was canceled
Performed by 2.8.1 Software version.
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Platform: Samsung Android
Selected port: COM12
Selected model: SM-G550T1
Operation: Reset FRP - UART EMMC
Searching for UART interface.. COM194
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...
Searching for UART interface.. COM194
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 (1/2 attempt)..success
FRP / Reactivation lock is successfully reseted!
Performed by 2.8.1 Software version.
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Platform: Samsung Android
Selected port: COM12
Selected model: SM-G935A
Operation: Read Codes
"Devices with Unlock App (branded to T-Mobile, MetroPCS, etc.) are not
supported!

Make sure device requests to enter unlock code and only then perform
“Read Codes” operation!"

Continue?
Searching for a phone. Please wait...
Detected phone model: SM-G935A
Firmware compiled date: Mon Aug 14 12:23:42 KST 2017
PDA version: G935AUCS4BQH1
CSC version: G935AATT4BQH1
SW version: G935AUCS4BQH1
Phone SN: RF8HA050T2P
Android version: 7.0 (NRD90M)
Sales code: ATT
Country: USA
HW platform: msm8996
HW Chip: MSM8996
HW Modem: MSM8996
Security patch level: 2017-08-01
Warranty Void: 0
SIM 1 status: absent
Codename: hero2qlteuc
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Connecting to server ..
Username: headszone18
Connect to server successfull.
Checking smart card...
Smart card successfully checked.
Your balance: 50 credits.
-----------------------------------------------------------------------------------
Rebooting phone in Upload Mode...
Searching for a phone. Please wait...OK
Reading data...OK
Detecting security type...(0)
Searching for signatures...OK
Sending request...
Performed by 2.8.1 Software version.