Yesterday I updated my Archer C7 V5 to the latest firmware version (Build 20210125), and now the Ethernet ports don't work with my Deco E4R. There are no issues with WiFi whatsoever. When I plug a deco into one of the LAN ports on the Archer, the corresponding LAN LED lights up, but the Deco does not show up under wired clients in the Archer's configuration page, and the Deco can't connect to the internet.

I can confirm that the Ethernet works with two laptops running Windows 10 and a Raspberry Pi running Raspberry Pi OS, and the only device that does not work are my Deco E4Rs. I also made sure that the problem wasn't the Decos. I connected a Windows desktop to the Archer C7 via WiFi, shared the internet connection to my desktop's Ethernet port and plugged a Deco into it, and the Deco connected to the internet without any problems.

I see two possibilities here: Either there is something wrong with the configuration with my Archer (since I lost my settings after updating the firmware), or there is a bug in the latest firmware. I would like to know if other people has had this problem or has a solution.