@demurov Hi, as far as I know, the Archer C9 doesn't support the Offline Download feature, nor other models.

@demurov Hi, sorry to hear that. Please confirm again the below info: Is the Archer C9 powered on by the original power adapter? Was there any power cut or bad weather or firmware upgrading before it...

@HenkHam Hi, the screenshot seems the default setting on the C5400, can you please show me your C5400 setting page? If it is possible, we hope you could try to reset the C5400 to factory default and...

@jcdeichmann Hello, do you remember what is the previous version of the firmware? As far as I know, there is nothing changed on the new firmware related to NAT or port forwarding, so you may try to...

@Sandro_B Hello, may I know who is your ISP and what is the detailed network topology? When a laptop or phone is connected to the C3150's wireless network, what is the IP address it can get? Can you...

@Jerzyski Hi, you may login to the web UI of the Archer C20 as below: https://www.tp-link.com/support/faq/1523/ Then go to Forwarding-UPnP to enable it. May it help.