Burbycian Burbycianovich

I apologize in advance if I wrote to the wrong branch. Dear community, a question about OrangePi 5B (board without SPI-flash!). There is only an eMMC on the device. The computer is successfully running on the OS from the Orangepi website, recorded both on the SD card (Baleno Ether) and with eMMC (MaskROM+RKdevtool). At the same time, I see the devices themselves and their partitions, SD card and/or eMMC. The Armbian OS for OrangePi 5/5B/5 Plus (CLI or GUI) written to the SD card loads and works, BUT disk commands DO NOT SEE eMMC, only SD card partitions. In Armbian-config, there is only the Insatall/Update bootloader on SD/eMMC item, which does not change anything. If you write Armbian images to eMMC (MaskROM+RKdevtool), they are successfully recorded, but at startup, no further initramfs loading occurs. If I try to boot from the UEFI-boot (EDK II) located on the SD card, then a cyclic reboot occurs, and when I enter the UEFI-menu, I cannot save the changed settings. As far as I understand, I need to place bootfs of third-party OS on eMMC. Actually, this is the question - how to do it? Ideally, I wanted not to touch eMMC at all, but to boot from a USB HDD/SATA/Flash drive, but this is the second question that cannot be solved without the first one.))) To all those who answered, thank you in advance!)))