@yourpie I know how to upgrade TP-Link Wireless Router, but I don't know how to downgrade. I tried to upload firmware v1.1.2 in the menu: System->firmware update->local update, it will appear "upload...

The problem was solved. After I downloaded the firmware Archer BE550_V1-1-2-1-20250813-rel27119 and manually upgraded the firmware, I found that WireGuard VPN was working properly.

Hello, My Wireguard VPN Client works fine as expected on BE550 firmware V1.1.2 (rel18331), but Wireguard VPN Client do not pass anything on BE550 after upgrade firmware to V1.2.1 (1.2.1 Build...