I tried many other tools, all failed. Thanks to GC Team. Thumbs up from me.
Code:
Using Version...1.0.0.0087
Selected Model GT-I5500
Selected Task SAMSUNG ADB UNLOCK
Searching ADB device Please wait..
Device Detected...
SELinux := Enforcing
model:= SM-T837T
Android Version:= 10
Description Version:= gts4lltetmo-user 10 QP1A.190711.020 T837TUVU4CTI1 release-keys
Platform:= msm8998 [ qcom ] [ MSM8998 ]
Baseband:= T837TUVU4CTI1
VER:= T837TUVU4CTI1/T837TTMB4CTI1/T837TUVU4CTI1/T837TUVU4CTI1
Carrier := TMB_USA
Knox Warranty := Not Void AP UART Status := Enable Already.
Security Patch := 01-08-2020
ABI:= arm64-v8a SDK Ver:= 29
Simstatus:= ABSENT
ANDROID-ID = ce10182a1045731c017e_0000EE867B
Device is not rooted
SAMSUNG ADB UNLOCK STARTED...
Please Wait while...
Loader Ok Starting task...
MSLAddress := R52KXXXXX
Local msl-db found..
Detected TMB
!!! Success !!!!
Restart Phone Manually if not done auto...
Total Time Take...00:01:48