The Federal Communications Commission recently adopted rules that required makers of WiFi routers to prohibit users to change some parameters of their devices. And some device makers have decided that ...

DD-WRT is an open source, Linux-based replacement for the firmware that comes with many WiFi routers. It has a reputation for giving users more control over their router’s performance and security.

Most router makers plan to block DD-WRT and other third-party firmware come June 2, but not Linksys. Its WRT line won’t prevent the installation of such firmware, the company announced. Federal ...