Using Armbian_20.08_Odroidxu4_buster_legacy_4.14.191.img on my HC1 I saw the same "error" message as PawelW. I also made the symlink /boot/boot.ini -> /boot.ini to make the message go away.
Press quickly 'Enter' twice to stop autoboot: 0
** File not found /boot.ini **
## Executing script at 43e00000
Confirming that PawelW's second issue also happened for me. Adding verbosity=7 to armbianEnv.txt had no effect. I had to change the value in boot.ini which says "DO NOT EDIT"