A500G write Cert failed

Reading phone info…
Reading IMEI… OK
IMEI: 356320064190293
Reseting MSL security… OK
Reseting… OK
Reset MSL done

Done with Samsung Tool PRO v.26.8

Checking CERT file… OK
KEY ID: 0756
Waiting ADB device… OK
Reading phone info…
Model: SM-A500G
Android version: 5.0.2
Product code: SM-A500GZKDINU
Phone version: A500GXXU1BPB2
PDA version: A500GXXU1BPB2
CSC version: A500GODD1BPB2
CSC country code: India
CSC sales code: INU
HW version: MP 1.100
Phone SN: 00000000000
Modem board: MSM8916
RF cal date: 2015.02.15
IMEI:
Initialization AT RIL… OK error (2)
First reset MSL

Done with Samsung Tool PRO v.26.8

Reset MSL ok but why its error