@Dani_RM
There were some u-boot related issues with older Armbian images related to boot device detection. If you have any Linux based host or another board, can you please
download http://apt.armbian.com/pool/main/l/linux-u-boot-orangepiplus2e-default/linux-u-boot-orangepiplus2e_5.23_armhf.deb
extract u-boot-sunxi-with-spl.bin from this package (using dpkg-deb -R or any archive manager that can open .deb files)
update u-boot on SD card with Armbian image using dd: dd if=u-boot-sunxi-with-spl.bin of=/dev/sdX bs=1024 seek=8
where /dev/sdX is a device node representing your SD card in card reader
... or just wait for beta image release or new official release for this board