This is the most skipped step—and the most common cause of failed updates. “Tenda Wireless N300” describes a family of routers, not a single device.
: A firmware update may reset your custom Wi-Fi name and password. Note these down or use the "Backup" feature in settings before updating.
: Do not turn off the router during the process, as this can cause permanent damage.
This is the most skipped step—and the most common reason for failed updates.
Firmware is the low-level software that controls your router's hardware. Manufacturers like Tenda release updates for three primary reasons: