G920p hidden menu error

dear team

I already did the unlock process but when I am trying to get the menu to activate gcf I get an error on shell do you guys know why

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

shell@zerofltespr:/ $ su
root@zerofltespr:/ # am broadcast -a android.provider.Telephony.SECRET_CODE -d android_secret_code://IOTHIDDENMENU
der.Telephony.SECRET_CODE -d android_secret_code://IOTHIDDENMENU <
Error type 2
android.util.AndroidException: Can’t connect to activity manager; is the system running?
at com.android.commands.am.Am.onRun(Am.java:301)
at com.android.internal.os.BaseCommand.run(BaseComman d.java:47)
at com.android.commands.am.Am.main(Am.java:102)
at com.android.internal.os.RuntimeInit.nativeFinishIn it(Native Method)
at com.android.internal.os.RuntimeInit.main(RuntimeIn it.java:255)