Allow the installation wizard to completely flash the downgraded firmware package. The router screen may turn blank or show a downloading icon. Step 4: Flash the Modified WebUI

Simultaneously press and hold the button and the Power button.

Firmware numbers that start with 2x.3xx are often difficult or impossible to unlock with simple code‑based methods. Newer AuthVer 4 devices (especially firmwares 21.327.xx.xx ) are also much harder to handle with free tools – some users have reported exhausting all unlock attempts without success.

Open your firmware flashing tool (such as or the standalone firmware executable file).

: If you need to access the dashboard to check status, the default username and password are typically admin .

⚠️ Many “free” unlock files online contain malware or are incomplete. Always scan with VirusTotal.

: Newer firmware versions feature secure bootloaders. These bootloaders block standard unlock code calculators or unofficial firmware modifications.

Necessary for your computer to communicate with the modem ports.

Flashing third-party firmware voids your manufacturer and carrier warranty.