Forgot to mention, you have to compile the u-boot and not use the one provided by Radxa.
Clone this one https://github.com/Stricted/deadpool_u-boot_build
./build_radxa0.shcp uboot-bins/u-boot.bin /mnt/volume_tor1_01/android/lineage/device/radxa/radxa0/factory
That’s before calling the m aml_upgrade.
Otherwise the device wont boot.