Thanks for your answer. I have followed your advice and used the version focal with desktop (Armbian_20.05.5_Arm-64_focal_current_5.7.0-rc7_desktop_20200529) with the dtb (meson-gxl-s905x-nexbox-a95x).
My tvbox is mini m8s: S905 with 2gb RAM , 8gb ROM and Ethernet 100m while Nexbox a95 x is S905x; 2gb RAM, 16gb ROM and Ethernet 100m. All run fine: Ethernet, wifi, bluetooth, sound.. But I have a only problem, I connect my box a TV 32" LCD 1366x768 with HDMI port, and my desktop is a little bit larger than my TV screen. I try to change the display but only offer TV 40" with other resolutions, obviously a I have tried to change the setting of my TV without results. I have also tried xrandr command but it show "can´t open display". Any solution for it?.
Thanks in advance.