Samsung j727p unlock failed

DEAR CHIMERA TOOL,

WHAT CAN BE THE CAUSE?

Chimera Mobile Phone Utility version: 22.16.0809 @ 2019-08-27
Unlock phone started
Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-J727P
Sales Code: BST
Country Code: USA
Timezone: Africa/Lagos
Android Version: 8.1.0 [M1AJQ] [SDK 27]
Build Date: Fri Nov 16 21:10:11 KST 2018
PDA Version: J727PVPU4BRK4 [november 2018, rev4]
Phone Version: J727PVPU4BRK4 [november 2018, rev4]
CSC Version: J727PSPT4BRK4 [november 2018, rev4]
Product Code: BST
HIDSw Version: J727PVPU4BRK4/J727PSPT4BRK4/J727PVPU4BRK4/J727PVPU4BRK4
Board Platform: MSM8953
Modem Platform: MSM8953
Serial Number: 00000000000
Imei: 353559084342748
Unique Number: CQ30087B0DED284
Connections: AT,MTP
Battery Status: 3.95V (56%)
Network Type: CDMA
SIM Status: ABSENT
Multisim Config: SS
Knox Version: v30
Warranty Bit: 1
Security Patch: 2018-11-01
Data Encryption State: encrypted
Unlocking...
Checking modem.
Downloading modem image. Be patient! Do NOT disconnect the phone!
Checking downloaded image.
Decompressing modem image.
Flashing modem image.
Switching to download mode.
Waiting for download mode.
Connecting.
Reading PIT from phone.
Flashing adspso.bin
Flashing modem.bin
Restarting phone.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
Checking SIM card.
Restarting phone.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
Preparing...
Checking debug level.
Restarting phone.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
Restarting phone.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
The phone will restart in upload mode, this is normal operation, do not worry!
Switching to upload mode. Be patient! Do NOT disconnect the phone!
Waiting for upload interface...
Waiting for upload interface. Be patient! Do NOT disconnect the phone!
Upload interface: SAMSUNG Mobile USB Modem (COM16)
Reading data...
Reading data is in progress. Be patient! Do NOT disconnect the phone!
Calculating...
Calculation is in progress.
Failed. Trying again.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
Preparing...
Checking debug level.
The phone will restart in upload mode, this is normal operation, do not worry!
Switching to upload mode. Be patient! Do NOT disconnect the phone!
Waiting for upload interface...
Waiting for upload interface. Be patient! Do NOT disconnect the phone!
Upload interface: SAMSUNG Mobile USB Modem (COM16)
Reading data...
Reading data is in progress. Be patient! Do NOT disconnect the phone!
Calculating...
Calculation is in progress.
Failed. Trying again.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
Preparing...
Checking debug level.
The phone will restart in upload mode, this is normal operation, do not worry!
Switching to upload mode. Be patient! Do NOT disconnect the phone!
Waiting for upload interface...
Waiting for upload interface. Be patient! Do NOT disconnect the phone!
Upload interface: SAMSUNG Mobile USB Modem (COM16)
Reading data...
Reading data is in progress. Be patient! Do NOT disconnect the phone!
Calculating...
Calculation is in progress.
The operation is unsuccessful. Please try again!
Unable to unlock.
Finished at local time: [08.27.19 14:07:53]
WorkID: 71105729