@Amarjyoti This is apparently a mistake by TP-Link. The downloaded file "Archer A6(US)_V2_210226.zip" contains no firmware, but just some random log file. I suggest you just wait until TP-Link staff...

@choiii I think you already answered your own question. If your old router established the connection to your ISP via PPPoE, then you will have to setup the C80 the same way, if you want to connect...

@Sundar_988 On Monday the support people from TP-Link should be back here. Maybe they can help you further with your problem. But like I said, the possible reasons for the "Can't connect to this...

@Sundar_988 Apparently the message "Can't connect to this network" is a very general error and the possible causes are aplenty. I recommend you open Google, search for something like "windows wifi...

@Normunds If you want to go the way of cascading home-grade routers via LAN -> WAN, then a potential solution would be to setup the devices that are connected to router B to listen on different ports...

@mrbrown What is the status of the "Internet" LED on the AX3000? (green, orange or off) Have you previously had another router that was working fine with your Chorus fibre connection, before you got...