Looks like for my eachlink H6 model (not mini), need another u-boot. None of the tested variants did not produce results. Android starts. When you connect the SD card, there is no launch of Android (so there is an appeal to the SD card). On TX6 if is used not the right DTB, there is modicum any message, and here full silence. Without UART it is not clear what is happening. I tried to connect UART, but there is no output to the console at all. On infe in Internet, on this model there is no full-fledged UART, lacks parts of details.