AOS R10.5.3 was released and posted for the TA-900/900e series. R10.5.3 is a maintenance release only. It includes bug fixes found since the release of R10.5.2. It does not include any of the features available in later feature releases (R10.7.0, R10.8.0, etc.). Please reference theAOS R10.5.3 Release Notes for specific details. The TA-900/900e series firmware can be downloaded from the firmware landing page links for each product below.