Test version of the Armbian+EDK2 system (UEFI\grub) is available. The system startup control is performed as on a regular PC - through the menu on the monitor screen, therefore, to fully use all the features of selective startup, you need to have a connected monitor and keyboard   To use this option. Download the EDK2 image.   https://users.armbian.com/balbes150/edk2/ https://disk.yandex.ru/d/kK6KIqHShRHLyw Unpack and burn to SD card. Download the Armbian image