Verbose Mode is dropped on macOS Sierra?
System Integrity Protection (SIP) disables changes to NVRAM. In order to make changes, you need to temporarily disable SIP by doing the following:


Boot into Recovery Mode. (Hold Command-R from the time you start your machine until the Apple logo appears.)
Open the Terminal from the Utilities menu.
Enter the command:

csrutil disable

Reboot and you will be able to run your desired commands from within a normal session.
It's strongly recommended that you re-enable SIP when you're done making adjustments. To do so, run this command:

csrutil enable



Note that if you intend to make a lot of changes to NVRAM, you can leave SIP enabled but disable NVRAM protection by running the following command from the Recovery Mode Terminal:

csrutil enable --without nvram


Again, you will need to reboot for changes to be effective.