This is a negotiation bug. Manually set the port speed in the web UI to 2.5Gbps Full Duplex, or upgrade to firmware version 1.0.122.

Xiaomi has pledged updates until 2026 for the AX9000, but the real innovation is now in the open-source camp. Recently, the OpenWRT community backported and Hardware Offloading for the AX9000, allowing it to route 10,000 concurrent connections without breaking a sweat.

Before flashing any third-party firmware, use the built-in SSH (enabled via a hidden URL: http://192.168.31.1/cgi-bin/luci/;stok=<token>/api/misystem/set_config_iotdev?bssid=Xiaomi&user_id=xxx&ssid=-h%3B%20nvram%20set%20ssh_en%3D1 ) to back up your original Bdata partition. That single backup can save you from a $250 paperweight.

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