Sm-g935a unlock failed

Using Version...1.0.0.0062
Selected Model GT-I5500
Selected Task SAMSUNG QCOM Code Read

Searching ADB device Please wait..

Device Detected...
SELinux := Enforcing
model:= SAMSUNG-SM-G935A
Android Version:= 8.0.0
Description Version:= hero2qlteuc-user 8.0.0 R16NW G935AUCS8CRK1 release-keys
Platform:= msm8996 [ qcom ] [ MSM8996 ]
Baseband:= G935AUCU8ARJ1
VER:= G935AUCS8CRK1/G935AATT8CRK1/G935AUCU8ARJ1/G935AUCS8CRK1
Carrier := ATT_USA
Knox Warranty := Not Void AP UART Status := Disable.
Security Patch := 01-11-2018
ABI:= arm64-v8a SDK Ver:= 26
Network Mode := LTE
Simstatus:= ABSENT
ANDROID-ID = 279b8431_0000897274
Device is not rooted

SAMSUNG QCOM Code Read started...
Please Wait while...
Loader Ok Starting task...
Searching samsung modem port...Found COM72
Reading...
Device detected...
Setting Dump Range....
Device := +MSM8996
Starting Dump device....
Verifying data...
IMEI-1:= 358445xxxxx
Chip Serial := 935b65e6
No simlock codes found Unsupported.

!!! Fail !!!!
Total Time Take...00:03:54
Log Saved
Failed getses0..
Card Error..0x821