X96Max_Plus_Q2，千M网口降速为100M，wifi能有600Mbps #3335
Description
设备是X96Max_Plus_Q2、4G + 64G版本
原厂android9通过开心电视助手，执行U盘启动直刷的。
U盘引导修改uEnv：FDT=/dtb/amlogic/meson-sm1-x96-max-plus-q2.dtb。
已经刷入最新的‘Armbian_26.02.0_amlogic_s905x3_bookworm_6.1.159_server_2026.01.01.img’。
网线是CAT.5E，插路由器、或者和笔记本网口（2.5G killer）对插也是100M。
开机时出现：downshift occurred from negotiated sepd 1gbps to actual speed 100Mbps, check cabling....
网口：RTL8211F Gigabit Ethernet。wifi没找到
执行iw dev wlan0 link：
Connected to xx:xx:xx:xx:xx:xx (on wlan0)
SSID: xxxx
freq: 5260
RX: 433998 bytes (3021 packets)
TX: 2936 bytes (28 packets)
signal: -56 dBm
rx bitrate: 585.0 MBit/s VHT-MCS 7 80MHz VHT-NSS 2
tx bitrate: 650.0 MBit/s VHT-MCS 7 80MHz short GI VHT-NSS 2
bss flags: short-slot-time
dtim period: 1
beacon int: 100
执行sudo ethtool eth0：
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 100Mb/s
Duplex: Full
Auto-negotiation: on
master-slave cfg: preferred slave
master-slave status: slave
Port: Twisted Pair
PHYAD: 0
Transceiver: external
MDI-X: Unknown
Supports Wake-on: ug
Wake-on: d
Current message level: 0x0000003f (63)
drv probe link timer ifdown ifup
Link detected: yes
有人能帮助我吗？感激不尽！