Thanks for the instruction WIth these I did flash today my 2 Opi Zero with  /usr/lib/linux-u-boot-dev-orangepizero_5.77_armhf/u-boot-sunxi-with-spl.bin (which I did build with the armbian-build-system today). Now this is my first testdrive to boot armbian from a usb-port  before this I did only boot from MicroSD or eMMC on ther boards.   Flashing went OK, but for comparing I couldnt use  mtd_debug read /dev/mtd0 0 404407 ./current.bin because this gives me a