Ok looks like I bricked my box forever with that method of installation (install-2018.sh with s912-uboot copied as uboot.img).
The firmware flash procedure does not even work anymore now. I now need to shortcut some pins from the emmc to start the flash process, and after that amlogic usb burning tools stops at 7%. It might be that pluging in the power source causes the system to boot, interrupting the interaction with emmc, but I am not sure. Any idea how to fix this, by forcing erasing of the emmc (even physically if possible).
I still have another S912 box, but keeping up to date with armbian is clearly too painful and risky, no installation guide whatsoever, just random bits of info here and there, generally without explanation of what happens under the hood, or link to opensource code, and high chance of bricking your box.
