Here's the kernel, uboot, dtb, and some reference files: https://drive.google.com/file/d/1r0-VhIPvTGCMiZZjIS6tQ4ZJNoIjFIe8/view?usp=sharing but I'm not familiar with your https://github.com/armbian/build process so I'm not sure how to slipstream them into a new build.