Every time I try to enable the 40mhz channel bonding for the 5ghz radio I receive the following error message, "slot is not disabled or customize is not enabled". This occurs from both the web and CLI interface.
You need to set the power and the channel before you can enable the 40mhz channel width.
Use one of these for above 40mhz:
Use one of these for below 40mhz: