Before hitting download, you need to know which architecture your AP-635 is running:
Have you run into a specific error with your AP 635? Consult the Airheads forum or contact HPE support—just make sure you have your contract ID ready. aruba ap 635 firmware download upd
Select "Access Points" and then sub-filter for "630 Series" or specifically "AP-635." Before hitting download, you need to know which