dell xps 9560 service tag change

Hi all

I replaced motorboard in dell xps 9560, i been trying change service/express tag but without any luck , only, i changed asset tag

I been try SVCTAG 3.4- where was error 2- this system is not supported by this utility

also i been going through tutorial from youtobe ---> Change / Remove Asset Tag - Service Tag on Dell PCs or laptops

asset tag been changed

but with asset /s is problem as below



DIAG c:/UTIL asset/s XXXXXXX ASSET -- version 2.09 (C) Copyright 1993-2014
Dell Inc About to change service tag. Are you sure? Y,nly
Error:Cannot change service tag Please ensure the tag is correct format, And the SETUP password is disabled
any ideas how I can change that

SVCTAG 5.1 ?

Thank You

 

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Thanks
Do You know what software i should use and commends, much appraised