I bought OPi 3 with 8 GB emmc, installed Armbian for OPi3, buster version, in the instructions I found a way to transfer the system to emmc - the nand-sata-install command. Then my actions:
1. Without apt update/upgrade try run nand-sata-install. There is only one option in the window that appears - Install/Update the bootloader on SD/ eMMC. Ok > WARNING > ok > done > ok. Reboot without sd > OPi3 not booted. Nothing changed.
2. apt update/upgrade, try run command. Only one option - Install/Update the bootloader on SD/ eMMC. Ok... Nothing changed.
What do I do wrong, maybe the version is not that, or do you need to download something? In the instructions immediately after starting and Running This Command offers three options.