CableLabs, the broadband industry research body, has warned that efforts to make Wi-Fi 7 access points work with older devices are creating fresh compatibility headaches, and is urging hardware makers to prioritise support for the industry's fix. The issue stems from how Wi-Fi 7 hardware implements WPA3 security, which the Wi-Fi Alliance made mandatory on the 6 GHz band used by Wi-Fi 6E and Wi-Fi 7, while older bands relied on a transition mode to keep WPA2 devices connected. This matters because it could cause consumers who upgrade their router to suddenly find older gadgets unable to connect, generating confusion and extra support calls for network operators.

CableLabs says more than 23 billion Wi-Fi devices are in use globally, many running on ageing Wi-Fi 4 or Wi-Fi 5 hardware, particularly in home networks with a mix of client devices. The Wi-Fi Alliance's proposed remedy, WPA3-Personal Compatibility Mode (PCM), shifts security information into new Robust Security Network Override (RSNO) elements so access points can serve both legacy and modern clients, but it only works if client devices also support RSNO — a capability still rare in current hardware. Without it, devices get bumped down to Wi-Fi 6 and WPA2-Personal even if capable of more, so CableLabs is pressing chipset vendors and device makers, especially those producing low-cost and smart home kit, to adopt and test for RSNO support.