AOS R10.9.1 was released and posted for the NetVanta 4000/5000 series. R10.9.1 is a maintenance release only. It includes bug fixes found since the release of R10.9.0. It does not include any of the features available in later feature releases. Please reference theAOS R10.9.1 Release Notes for specific details. The NetVanta 4000/5000 series firmware can be downloaded from the firmware landing page links for each product below.