If you tried too many wrong passwords, the ZTE F663NV3A might lock the admin account.
Many ISPs customize the firmware. If the default credentials above do not work, check the sticker on the bottom or side of the device. It will list the specific User Name and Password for that specific unit. Some ISPs use a unique random password printed on this sticker. password zte f663nv3a
| ISP / Region | Username | Password | | :--- | :--- | :--- | | | admin | admin | | Claro (Latin America) | admin | Claro@123# or Claro@2020 | | Telmex (Mexico) | telmex | telmex | | Movistar (Spain/Chile) | admin | Movistar123 or admin | | Telenet (Belgium) | admin | (Check sticker on the device) | | TIM / Vivo (Brazil) | admin | TIM#@$ or v3482 | | ZTE Default | root | Zte521 | If you tried too many wrong passwords, the
Look at the sticker on the back or bottom of the router. It often shows: It will list the specific User Name and