I can't contribute much to this other than stating, it's the same on my Rock64 2GB v2.0 but I also cannot boot:
Armbian_25.2.1_Rock64_bookworm_current_6.12.13_minimal.img.xz
I then tried one from here https://archive.armbian.com/rock64/archive (site currently throws error: Internal error - code should not reach this point so I cannot tell which one specifically I used) but that one booted fine.
-> This one worked for me: Armbian_23.11.1_Rock64_bookworm_current_6.1.63.img.xz