@Desan Hello, The username/password is the same as your login credentials for the web management page, which is admin/admin if you never changed them. Please check the following info if Tether failed...

@Sai18. Hello, Do you still use the original power adapter? Was there any power cut or bad weather or firmware upgrading before it completely "dead"? Do you have any other power adapter to give it a...

@ddadbb Hello, May we know the model number of your Gigabit Ethernet adapters and its driver versions, then we will escalate your case to the engineers, who will try their best to help you out?...

@Freaky_Patel Hello, only the business load balance routers such as TL-R470T+ or TL-R480T+ or TL-ER5120 has multiple WAN ports: https://www.tp-link.com/business-networking/load-balance-router/ Good...

@SriV Hello, I have just replied you in this thread: https://community.tp-link.com/en/home/forum/topic/219820 You need to connect this C80 to your computer with an Ethernet cable first.

@SriV Hello, It is suggested to try the firmware recovery to reinstall the latest firmware on your Archer C80: https://www.tp-link.com/support/faq/1482/ May it help.