Thank for reading my problems. I follow the guide in this link " https://www.udoo.org/docs-neo/Getting_Started/Create_a_bootable_MicroSD_card_for_UDOO_Neo.html " but still cannot boot up the board. It's show green light all the time. My setting: - Udoo Neo board full. - Micro SD 16G. - Power supply 12V, 2.5A - Boot using terminal in Macbook, also Etcher on Macbook and also terminal in Linux but the result is still the same.