supervisor/root and admin password of my NR7303

Hi! For security reasons, default supervisor/root and admin passwords are usually provided in the device manual or on a label under the router. If they've been changed and you don't have them, the best option is to perform a factory reset (hold the reset button for ~10 seconds). This will restore default login credentials. After resetting, try:

• Username: admin
• Pwd: 1234 (or blank)

If that doesn't work, contact the support with your serial number for verified assistance.