Need Help G850f error writing cert or SN

[peter gia03]

logs

Done with Samsung Tool v.19.1

Selected model: SM-G850F
Selected port: COM4 Z3X BOX Serial Port
Selected port speed: 115200
Checking certificate file... OK
Waiting ADB device...
Please, allow USB debugging on phone... OK
Reading phone info...
Model: SM-G850F
Android version: 5.0.2
Product code: Unknown
Phone version: Unknown
PDA version: G850FXXS2CQA2
CSC version: G850FOLB2COJ1
IMEI: Unknown
Phone S/N: Unknown
Checking Super user right... true
Reading nv data... OK
Checking magic... not found
Done with Samsung Tool v.19.1
Done with Samsung Tool v.19.1