sm-g920f failed with MSL

GSM Hosting 23-11-2015 Gsmhosting 3510
plz team help me for this
need to write cert .. :(

Device Info (UART)
Model: SM-G920F
SW Version: G920FXXU3COJ1
Customer Code: XSG
Unique Number: 03157DF35C9E6832
Flash Memory: -
Chipset : true
Key ID : 0346
Time used : 1.5 s

Connect to device ...
Device Authentication ... failed with MSL

need to write cert
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