Updates often reset the router to factory defaults. Have your PPPoE username and password (from your ISP) ready to re-enter afterward. 2. Downloading the Correct Firmware
If Tenda’s official link is dead, use the Wayback Machine to fetch old download pages. Navigate to web.archive.org and enter Tenda’s old support URL. tenda d301 v2 firmware update
: Never update firmware over Wi-Fi. A sudden drop in signal can interrupt the process and corrupt the router's operating system. Updates often reset the router to factory defaults