First, confirm that you have a Sonoff Zigbee 3.0 USB Dongle Plus. Go to Settings → Hardware → All Hardware → Search for Zigbee
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Check your current firmware version:
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Important: Stop Zigbee2Mqtt before flashing, as described in the docs!
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Now let’s add the ZigStar repository: Settings → Add-ons → Add-on Store → Three dots → Repositories → Add https://github.com/mercenaruss/zigstar_addons
After that, install the Add-on for Texas Instruments CC2652P7 based radios.
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Copy the firmware link from here: https://www.zigbee2mqtt.io/guide/adapters/
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Got to the Configuration of the installed ZigStar Add-on and paste the firmware link and select the two radio buttons like bellow.
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If you receive an error when saving the configuration, simply add 127.0.0.1 as Network Device and save again.
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If the Configuration is successfully saved, start the Add-on and flashing will start immediately.
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Switch to the Log tab and hit refresh until you see the “successfully stopped” message.
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Now you can stop the ZigStar Add-on and start Zigbee2Mqtt again and check your new installed version.
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Done.