Are you sure about "plus" ? I'm not aware of "plus" variant, I only know "OrangePi3" ...
If you original image is an Armbian image, U-Boot is loading /boot/Image, which is a symbolic link to vmlinuz-5.4.7-sunxi64. But it also load /boot/uInitrd, which is a symbolic link to uInitrd-5.4.7-sunxi64 and you also need to make sure you installed modules in /lib/modules/5.4.7-sunxi64.
Maybe it would be easier for you to use Armbian build scripts and compile a kernel package that would be installed with "dpkg -i linux-image-dev-sunxi64_19.11.7_arm64.deb" ...
buratino reacted to Igor in I put together a new kernel, what should I do to start a new kernel?