I received my Only key about 5 months ago.
Occasionally get a message in the app to update the firmware.
As I follow the process ef holding the #6 key for 5 seconds everything seems to work as described
but then it asks me which file to download.
I have searched for this file many times but cannot find it.
You need to download the file to your device from the official website and then load it to OnlyKey.
Pressing #6 loads the file, not downloads it.