Hello, I had a similar problem - unbootable Rock64 after kernel upgrade from 6.6.x to 6.12.x (error: Wrong Ramdisk Image Format).
You can look in this armbian forum thread djurny found a solution, that works for me. Maybe it will help.
Add to armbianEnv.txt
You can look in this armbian forum thread djurny found a solution, that works for me. Maybe it will help.
Add to armbianEnv.txt
Code:
# new load addresses
fdt_addr_r=0x01f00000
kernel_addr_r=0x02000000
ramdisk_addr_r=0x04400000