While parsing the API preview of Android P for developers, Reddit users made a curious finding. It seems that the new version of the mobile OS may not be available for older applications.It is reported that while parsing the API a new warning was found. It reports that the app was developed for an earlier version of Android and, therefore, may not work correctly. In this regard, the user is advised to check for updates or contact the developer. It is worth adding that the warning was found in the first preview of Android P for developers and it is not yet possible to say with certainty whether it will remain in the final version of the operating system. Nevertheless, we can not exclude the possibility that outdated applications will simply stop running in the new mobile OS.