g928t okc 5.1.1 FAIL Write cert

Operation: Write CERT
Selected model: SM-G928T
Software version: 23.8

Waiting ADB device… OK
Reading phone info…
Model: SM-G928T
Android version: 5.1.1
Product code:
Phone version: G928TUVS2COKC
PDA version: G928TUVS2COKC
CSC version: G928TTMB2COKC
CSC country code: USA
CSC sales code: TMB
HW version:
Phone S/N: 00000000000
Modem board: SHANNON333
RF cal date:
IMEI:
Checking Super user right… true
Initialization AT RIL… OK
Checking certificate file… OK
KEY ID: 0784
Initializating zTool… OK
Running zTool, please wait… error (7.7.8)

Done with Samsung Tool PRO v.23.8