I received this: Amazon will no longer be supporting the Prime Video app on your Roku device (The specific models no longer supported are: 3500X, 2710X, 2720X, 2700X, 3050X, 3100X, 2400X, 3000X, 2500X, 2450X, 3400X, and 3420X) as of 1st November, 2021. We are continually upgrading our service and this occasionally means we can no longer support certain device models.
How can you tell which device needs to be changed out?