galaxy s6 edge plus g928f PATCH CERT NOT WORKING

Hey all

I have a g928f galaxy s6 edge plus.

I tried to use the patch cert option

went through ok

here is my log

Operation: Patch Certificate
Selected model: SM-G928F
Software version: 24.2
Waiting ADB device… OK
Reading phone info…
Model: SM-G928F
Android version: 5.1.1
Product code: SM-G928FZDABTU
Phone version: G928FXXU1AOH3
PDA version: G928FXXU1AOH3
CSC version: G928FOXA1AOH3
CSC country code: UK & IRE
CSC sales code: BTU
HW version: MP 0.500
Phone S/N: RF8G82EP3DA
Modem board: SHANNON333
RF cal date: 20150827
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.24.2

but imei still remains the same

am I doing something wrong

I tried this 3-4 times

still same imei

plz help