No, one cannot perform the firmware upgrade process using the radio interfaces. In order to perform the firmware job one need to select the device hostname or ip address to perform the job. This device can be a root or non-root device.
In a specific situation where both root and non-root devices firmware needs to be upgraded one can perform the firmware job on the Non-root device first and then to the Root device without a problem. If the Non-Root devices are discovered and managed by the WLSE, one can perform firmware jobs using the Ethernet port.
Note : Non-root devices could be repeaters, with no ethernet ports, so these devices can not be upgraded via radio interfaces.
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