@TheOneGuy If the current firmware on your C6U is 1.0.4 Build 20201230 rel. 53346, you can download and save the firmware file from the TP-Link official website:...

@Robinn Is this AX50 working as the main router and DHCP gateway in the network? Are the QNAP TS251+ and TV obtaining IP addresses from the AX50 automatically? You can try to set Address Reservations...

@CDavis Is the internet not working on the AX3000? If that is the case, please go through the troubleshooting suggestions to connect to the internet: What should I do if I cannot access the internet...

@Pedr0x Thanks for the follow-up. The support engineers have sent you an email, and the ticket ID is TKID220805451, please check your email box and reply.

@SDHINESHKUMAR They have sent you an email already, and the ticket ID is TKID220805476, please check your email and reply.

@SDHINESHKUMAR To assist and figure it out efficiently, I've forwarded your case to the TP-Link support engineers who will contact you with your registered email address later. Please pay attention...