mr53e does not support unii-2 and unii-2-Ext channels

[LuizNeves]

Due to the high use of 5ghz channels, I need to use other channels with less use, but the UNI2 / UNI2EXT channels are not available on the dashboard for change.

The profiles for testing have already been changed but without success.

[Ryan_Miles]

Where are you located? Is the dashboard configured for the correct regulatory domain?

https://documentation.meraki.com/MR/Radio_Settings/MR_Regulatory_Domains