1. Test images must be used with the correct dtb (copy them additionally, manually to the media). 2. On X96 no console UART, so if not the right actions, you will not be able to find out what's wrong. There's only one restore option is to look on the chip eMMC contacts that it is blocked at the start, which would start flashing with USB from PC. 3. I have one card with the X96, it normally installs and runs Armbian in eMMC. I don't know what model you have, so no guarantees can not give. Perhaps you have clone and need to pick the correct dtb data.