write cert n910c Fail over and over Fail

Checking CERT file… ok
KEY ID: 0065
Waiting ADB device… ok
Reading phone info…
Model: SM-N910C
Android version: 5.1.1
Product code: SM-N910CZKECGU
Phone version: N910CXXU1COJ5
PDA version: N910CXXS2CPF2
CSC version: N910CUWM2CPC2
CSC country code: GT
CSC sales code: CGU
HW version: MP 0.800
Phone SN:
Modem board: DB7450R
RF cal date: 2015.01.05
IMEI:
Checking Super user right… true
Reading NV data… ok
Analyzing NV data… ok
Writing NV Data… ok
Rebooting phone… ok
Waiting ADB device… ok
Reading phone info…
Model: SM-N910C
Android version: 5.1.1
Product code: SM-N910CZKECGU
Phone version: N910CXXU1COJ5
PDA version: N910CXXS2CPF2
CSC version: N910CUWM2CPC2
CSC country code: GTT
CSC sales code: CGU
HW version: MP 0.800
Phone SN:
Modem board: DB7450R
RF cal date: 2015.01.05
IMEI:
Writing AT RIL… ok
Initialization AT RIL… error (11)

Done with Samsung Tool PRO v.27.1