Updating firmware is generally safe, but if done incorrectly, it can brick (permanently damage) your router. Follow these steps carefully:

| Precaution | Why It Matters | |------------|----------------| | Do not power off during update | A power loss corrupts the flash memory, making the D305 unusable. | | Use a wired (Ethernet) connection | Wi-Fi can drop mid-update. Use a LAN cable from your PC to any yellow LAN port on the D305. | | Disable antivirus/firewall temporarily | Some security software may block the firmware upload. | | Close other applications | Avoid network interference (torrents, streaming, downloads). | | Backup current settings | A firmware reset often clears your configuration. | | Confirm hardware version | The same model (D305) may have different hardware revisions (e.g., V1, V2). Using wrong firmware = brick. |


You can enable Auto-upgrade (if your TENDA D305 firmware supports it) under System ToolsAuto Update Settings.


Firmware updates fail due to interruptions. Mitigate these risks:

Before jumping into the “how,” it is important to understand the why. Many users neglect firmware updates, but here’s why you should prioritize them: