AOS R11.5.1 was released and posted for the NetVanta 1500/1600 series. R11.5.1 is a maintenance release only. It includes bug fixes found since the release of R11.5.0. It does not include any of the features available in later feature releases. Please reference the AOS R11.5.1 Switch Release Notesfor specific details. The NetVanta 1500/1600 series firmware can be downloaded from the firmware landing page links for each product below.