I got a radxa rock 5t and trying to install armbian(https://www.armbian.com/radxa-rock-5t), arimbian NOT boot and I can see the indicator light on the board is showing a steady green light.
I boot with the official image https://docs.radxa.com/en/rock5/rock5t/low-level-dev/maskrom/linux and insert the sd card(with armbian img), and run such command, then I can boot armbian from SD card
sudo dd if=/dev/mmcblk0 of=working_idbloader.img bs=512 skip=64 count=8000
sudo dd if=/dev/mmcblk0 of=working_u-boot.itb bs=512 skip=16384 count=8000
sudo dd if=working_idbloader.img of=/dev/mmcblk1 bs=512 seek=64 conv=notrunc
sudo dd if=working_u-boot.itb of=/dev/mmcblk1 bs=512 seek=16384 conv=notrunc
BTW, it seems there's no rock-5t tag, so I selected the 5b one
