Release 9.0 is the last release for the GateManager 4250 hardware platform.
Be aware that the 4250 platform may not perform optimally with the latest security features due to limitations in CPU performance. this relates to the main reason for the introduction of the more powerful 4260 platform in April 2015.
Generally, we recommend migrating to the GateManager 8250 platform as this exploits the extended capabilities of the release 9.0 software and will be the main platform to receive new features in future releases. Also the 8250 allows for applying platform services on the Linux operating system for optimum reliability, stability.