unable to write cert after succesful exynos unlock

Using Version…1.0.0.0037
Selected Port ssudmdm0000 = COM86
Selected Model SM-N920T
Selected Task SAM CERT WRITE

ALL SAMSUNG CERT WRITE STARTED..

Searching Phone Please wait…

Phone Found Wait…
TEST MODE OK..
Model := N920T
VER := N920TUVU3DPG1/N920TTMB3DPG1/N920TUVU3DPG1/N920TUVU3DPG1
Phone IMEI := 35255707042140
MSL Address:= ‘Þ鉄OË&^
RESET EFS FIRST OR USE MSL CODE…

!!! FAIL !!!!
Total Time Take…00:00:33

getting this error on different models now, even after successfully using exynos unlock option