@ArvidSmartHome Here's the device manual. What are you trying to achieve: 2.2.4 (AP) or 2.2.5 (Repeater/Bridge) mode ? I believe you are up to 2.2.5. For the DHCP setting - if now you configure DHCP...

@Crackz For the wireless part try these settings: Test wireless connection to see if that helps. Update your wireless card drivers to the latest. I couldn't catch your network topology, can you...

I was with: Security: WPA/WPA2-Personal Version: WPA2-PSK Encryption: AES on my old router and then the same settings on the new one and still had the issues described above.

Obviously it comes from a reputable source. I would suggest to wait until someone answers your issue before sending the device, if the service repair will last few weeks. It might be something easily...

@frankiebar It has happened to me as well, when I replaced an old C5 with AX20 router. Some smart/IoT devices are susceptible to that king of Wi-Fi standard change. From 5 clients, only 1 SONOFF...

Are you sure that you have Archer A7 ? Also HW version is printed on a sticker (on the back of the device). As far as I know Archer A7 doesn't support 4G dongle through a USB port. You can see the...