G920P error

team I am trying to activate gcf and it doesnt get active on a g920p I rooted the phone to activate the menu with adb shell sending the follwing command

am broadcast -a android.provider.Telephony.SECRET_CODE -d android_secret_code://IOTHIDDENMENU

but I get and error type 2. do you guys know any other way to activate gcf or if Im typing something wrong