What is exactly the file you are using (copying) from the image Recalbox ? I need the full name of the DTB file used. If running Armbian happens, you can try to perform the initial configuration. If you took a desktop image, you need to log in to the console as "root" with the password 1234, change the password, create a new user, set the password and see if the graphical desktop shell will start.
Hello balbes150 ,
a moment, I used your image Armbian_5.96_Rk3399-tv_Debian_buster_default_4.4.154_20190913.img.xz, there is no X included.
Just download Armbian_5.96_Rk3399-tv_Debian_buster_default_4.4.154_desktop_20190913.img.xz and continue testing.
The Recalbox DTB is in the appendix.