@Bogle Not all regional support pages are up to date when a new FW version is issued - usually it takes time for that. For UK you can use the global english support portal - here's the FW (EU)...

@Yousef17 Check its datasheet - here: "Combined with OFDMA and MU-MIMO, 12 streams won’t affect your online gaming."

@Jay656 Here it is - Archer C5400X(EU)_V1_1.1.7 Build 20240510 Published Date: 2024-05-24

@Bogle I would recommend to try the 2/3 mix on the main network and if that doesn't work for you use the defaults setting. If you put printers and TVs on the guest network and it's isolated from your...

@Pettefar If you've meant the system uptime, this may have not been implemented - not all router models have this feature - check this feature request for example.

@Torrential Have you tried to edit/delete the old WAN connection ? The device may have a limit of only one WAN connection.