befvp41 V1 firmware no longer works with DDNS. The router says it updated fine, but dyndns.org shows the update did not take place. Apparently, Linksys did not use dyndns.org proper procedures when developing the firmware that does the update. Then dyndns.org changed some of their background routines, that "broke" the firmware. Note that this is not a problem with V2 of the same model.