Zigbee devices are updated using the driver details.
If available the driver will contain a updateFirmware command, when executed the firmware update results are sent to the live logs.
Hubitat securely stores zigbee firmware update files in our cloud servers making them available to all users. There is no manual process available for user supplied files.
We currently do not have a source for linkind firmware files, and i dont even know if they have any files anyway.
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