New versions and updates of mobile operating systems are released on a regular basis. For devices with manufacturer-specific extensions of their respective operating systems, the manufacturers must first integrate these extensions into their versions before proceeding with distribution. Updates are usually provided for the latest device generation and for a number of older device generations. However, not all previous operating system versions are supplied with (security) updates to the same extent. In some cases, operating systems are not further developed for economic reasons. Vulnerabilities in an operating system of a device generation that has been discontinued can then no longer be closed by updates, which makes them particularly easy for attackers to exploit.