We have an IAP cluster of 8 IAPs (1-335, 3-325, 2-215, 2-205) using a virtual controller. Attemping to add 2-305s but they will not auto join. They are currently running 6.5.4.3_61877 firmware. We looked for this firmware for the 305s to upgrade them and can only find 6.5.4.2_61807. How do I get these new 305s to join?