Macard WiFi Extender Blinking

A Macard WiFi Extender Blinking Blue Light indicates that the device is in the process of booting up or connecting to the network. If the light continues to blink, there might be a connectivity issue. To resolve this, you can perform a factory reset using the physical reset button or the Web GUI, which will restore the extender's settings to their default state and allow you to reconfigure it for your network.

https://macardwifi.com/macard-wifi-extender-blinking-blue-light-quick-troubleshooting-guide/