Hi @iloving, what makes you say that Duo relies on Flash? Do you see a particular error message somewhere? While the Duo Prompt does not rely on Flash to run, it may appear as though it does due to passive detection of the use of Flash. If an organization has a policy in place with Flash-based restriction, for example, then you might see a popup reminder that your Flash version is out of date. Similarly, some plugins for Duo-protected applications may use Flash. It would help to know which application(s) you are using with Duo, then we may be able to comment further.