I would highly recommend that the alert that appears when configuring the epmp 425 for max range be changed or disabled. An orange triangle with exclamation point appears and makes you believe that something is wrong and the link is not configured appropriately. At the very least a note should be added when you hover over the alert that this does not prevent the link from working properly.
Also, under recommended upgrade, it currently says 4.6.1 is the recommended firmware for these radio’s. That is an 802.11ac firmware, The 802.11ax firmware’s begin in the 5.X’s.