G900A reactivation failed

Using Version...1.0.0.0058
Selected Port SAMSUNG Mobile USB Modem #11 COM34
Selected Model SM-G900A
Selected Task SAMSUNG RLOCK_ADB

Searching ADB device Please wait..
Device Detected...
Security:= OFF Unsecure device
SELinux := Permissive
model:= SAMSUNG-SM-G900A
Androids Version:= 5.1.1
Description Version:= klteuc-user 5.1.1 LMY47X G900AUCU4COI5 release-keys
Platform:= msm8974 [ qcom ] [ ]
Warning Baseband is Unknown or damaged....
VER:= G900AUCU4COI5/G900AATT4COI5/G900AUCU4COI5
Carrier := ATT_USA
EFS CSC := ATT
Knox Warranty := Not Void
ANDROID-ID = a740b2c4_0000477376
Device is Unsecure Rooted

SAMSUNG RLOCK_ADB UNLOCK STARTED...
Starting RLOCK Remove..

Phone Found Wait...
Model := 900AU
VER := 900AUCU4COI5/G900AATT4COI5//G900AUCU4COI5
Phone IMEI := AT+IMEITEST=1,
Fail to get reply...

!!! Fail !!!!
Total Time Take...00:00:59
Log Saved


I try clear cache and wipe data and write stock firmware again and nothing.