I'm no expert on Allwinner hardware, but I had a quick look at the device-trees in the Linux 6.17 kernel source, our current Allwinner patchset, and kernel mailing lists (for new patches) and I see no evidence of HDMI support for the H616 or H618 chips existing. This means you will see boot screens due to framebuffer support in the kernel, but there's no HDMI (DRM) driver, so Kodi cannot run.
If you add 'ssh' to boot params in extlinux.conf the SSH daemon is forced to start and you can login, but you'll only see kodi.log messages about there being no DRM surface or gem object to render to.