@hexdump I have been try all of this dd your uboot-rk3318.img and add rk3318-h96max.dtb file. I will try one more time. What is the effect of which linux image is recorded on SD? For chose correct dtb file need only to change name in "/extlinux/extlinux.conf"?
I have the same TVbox, but i have some problem with booting armbian. I burn SD card with armbian image then dd of trust.img and uboot.img but uboot stopped at DRAM point U-Boot 2019.10-armbian (Nov 29 2019 - 09:50:19 +0300) Model: Rockchip RK3328 EVB DRAM: Tell me please how you boot armbian more details