Hi @guitoscan, thanks for your work. Its possible to boot into multitool. The trick is to boot into android recovery and from this point into multitool. I hope that helps.
I got the same box. Thanks to your tipp, I could boot multitool. I try to make a backup of emmc, but it holds by about 6%. After that I try to boot with the same method armbian (via SD Card), but I don't get a picture. Any hints?