[q] samsung sm-g920x demo how to unlock/ change rom/root.help me - Galaxy S6 Q&A, Help & Troubleshooting

hello to all. please , i'm looking for your help.
my friend 's gave to me one "sm-g920x" by samsung.
it has a demo mode. the phone come from dealer.
how can i unlock it?
how may i change toe firmware?
how may root the phone?
please help me to resolve this problem.
because the phone doesn't work fine...it's impossible for me to use this phone.
so please help me

Hope this helps you. I also have the same problem.
http://forum.xda-developers.com/galaxy-s6/help/galaxy-s6-live-demo-unit-model-sm-g920x-t3096172

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