n910t 5.1.1 write cert fail

i succesfully reset my msl and keep getting this error even after resetting msl..

Operation: Write CERT
Selected model: SM-N910T
Selected port: COM6 SAMSUNG Mobile USB Serial Port
Software version: 23.9

Checking certificate file… OK
KEY ID: 0772
Waiting ADB device… OK
Reading phone info…
Model: SM-N910T
Android version: 5.1.1
Product code: SM-N910TZKETMB
Phone version: N910TUVU2DOK2
PDA version: N910TUVU2DOK2
CSC version: N910TTMB2DOK2
CSC country code: USA
CSC sales code: TMB
HW version: REV1.1
Phone S/N:
Modem board: MDM9225M
RF cal date: 2014.11.11
Initialization AT RIL… OK
Bypass MSL… error (2)
First reset MSL

Done with Samsung Tool PRO v.23.9