From the FAQ you linked it has to bet set and saved:
Q: How do I set the Country Code to enable the radio?
The correct Country Code must be set for the country in which you operate the access point so that it uses the correct authorized radio channels for wireless network devices.
The North America product, J8130A, comes with the Country Code pre-configured; the worldwide product, J8131A, does not. The radio is disabled if the Country Code is not set. Once the Country Code is set and saved, the radio is enabled.
If you are using the worldwide product, J8131A, before configuring radio settings on the access point, you must first use the CLI to set the Country Code. You can display the available country codes in the CLI by using the country? command from the Exec level. After a Country Code is entered the country command is removed from the Command Line Interface (CLI). If an invalid Country Code has been entered, reboot the access point by pressing the reset button for at least five seconds. This restores the factory default settings.