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Once you identified the beacon that you want to update, simply tap on it to enter its detail page.
Connect to your beacon
When in your beacon's detail view, tap on "Connect" to start the connection process. Your beacon will now run through a couple of connection stages. Please wait until your beacon's status says "Connected". The screenshots below show the full connection flow: (if the beacon has a password then type it into the password field)
Install the latest firmware
As soon as your beacon is connected, please scroll the detail view all the way down. If there is an updated firmware available for your beacon, you will see a button that says "Update firmware". Tap on it to continue.