@vanngocan Basing on my experience, the dtb file meson-sm1-sei610-ethfix.dtb works well with TV box has Gigabit Ethernet. You should check LAN speed of your TV box. If LAN speed is 100 Mbs, try to use dtb file meson-sm1-sei610.dtb or another one.
I bought X96Air S905X3 but only 2 Gb Ram and Ethernet is 100Mbs speed. Successful installed Armbian bionic with meson-sm1-sei610.dtb and also installed AdGuardHome to it. LAN & Wifi works well. No problem with color & resolution except Bluetooth does not working. There is a small issue that I can not boot from SD card (Message: “Error -84 whilst initialising SD card” while booting). So I have to boot from USB. Can anyone advise me how to boot from SD card? Or do I need to buy a new SD card? (The function of card slot is normal in Android mode) Thank you.