How to upgrade firmware offline?


my device has the same issue ‘device is already activated’. I contact canary by the ticket.
he say that he can help me to deactivate. but need my device online to upgrade the firmware. unfortunately my firmware is too old v1.2.1. the device can’t connet to the server? so the staff can not remove and deactivate canary for me.
what can I do now?
can I upgrade the device by myself?


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