g920f no network after write cert file


plz help….
i am writen meny cert file

this is info

Waiting ADB device… OK
Reading phone info…
Model: SM-G920F
Android version: 5.1.1
Product code:
Phone version: G920FXXU3COJ6
PDA version: G920FXXU3COI9
CSC version: G920FBTU3COJ1
CSC country code: UK & IRE
CSC sales code: BTU
HW version:
Phone S/N: RF8G400640P
Modem board: SHANNON333
RF cal date:
IMEI:
Checking Super user right… true
Initializating zTool… OK
Running zTool, please wait… OK
Reading modem… OK
Patching modem… OK
Writing modem… OK
Rebooting phone… OK
Patching CERT check… done
Done with Samsung Tool PRO v.25.2