First, DSL router owners got an unwelcome Christmas present. Now, the same gift is back as an Easter egg. The same security researcher who originally discovered a backdoor in 24 models of wireless DSL routers has found that a patch intended to fix that problem doesn’t actually get rid of the backdoor—it just conceals it. And the nature of the “fix” suggests that the backdoor, which is part of the firmware for wireless DSL routers based on technology from the Taiwanese manufacturer Sercomm, was an intentional feature to begin with.