Why Repair Network not working

Hi guys i bought this box last week and i have G4 H818P when i update the phone from 4.4.2 to 5 i can’t use my simcard, Baseband and IMEI is OK.
my frieand told me write QCN but i can’t fine QCN for H818P and i request here but nobody help me :
Again my frieand told me Repair network but i don’t know why this section not available , somone told me it’s disabled by developer of Octopus why can not use this section?
please someone Help me with this problem and i flash the phone with 5 firmware (Marshmallow and Lollipop) but problem not solved yedt

Sorry for bad English 😀