@DanielChen Can you please in more detail? What do you mean that the new firmware has security issue? Kindly provide us mode info, then we will try to confirm if it can be fixed. Thanks.

@CHUHY Thanks for the details. If that is the case, we would like to investigate the issue further by following it up via email, please check your email box and respond.

@CameraTricks Can we confirm the exact model number of the AX1800, is it Archer AX20 or AX1800? Were you able to find the WDS option on the web GUI? If yes, please show us some screenshots about the...

@Omarfa It is suggested to follow this guide to dial up on the computer directly to confirm if the username and password provided by your ISP are correct, and the internet should be working fine:...

@Heinzreudi Hi, if the AX73 is the main router, then you may change the Deco M4 into Access Point mode, the typical network layout could be as follows: https://www.tp-link.com/support/faq/1794/ If...

@StanStar7 When you connect the DSL modem to the 2.5Gbps port, please check it is acting as the Internet port as per the web GUI: