@dresoccer4 According to its specifications AXE75 has got 1x gigabit WAN port. That means whatever category ethernet cable you connect to its WAN port (Cat5E, CAT6, CAT7, CAT8) the throughput would...

@MrJJ Probably it makes sense to try that, since your device is out of warranty, power adapter is working (as you stated), resetting the device doesn't make any difference and you have no other...

@MrJJ The FW version you mentioned is a beta release. Here's the latest official (EU) FW release for Archer C6 v2 - v1.3.7 Build 20220613 Aside from that, there are two options: 1. Your router died -...

@dresoccer4 That's just my assumption, but yes, usually you could choose the channel exact width. This device supports TP-Link Cloud Service, so you'll know when a new FW has been released, either by...

@dresoccer4 Well, I see that it's the first FW release for this model - it's quite a new device. Usually when Smart Connect feature is enabled, you can't choose a wireless channel or a channel width....

@dresoccer4 Try deselecting Smart Connect Feature and then set the channel width to a particular value. When Smart Connect feature is active, you can't select a particular channel width: