How to work with g928v?

Can someone tell me how to work with g928v ?

phone is running 5.1.1 OJ2

dont know how to root and all root methods fails.
Need to enable QCDI mode and without root dont know how to do it since this phone is not accepting any codes like> 0808 9090 06 0011, 366333 etc

I want to start by reading QCN from phone, teh continue to other tasks