You can use aarch64 ISOs on some ARM64 computers through UEFI, RPi3+ included. Need to install firmware though. Similar if you use Tow-boot on some Pine64 devic

You can use aarch64 ISOs on some ARM64 computers through UEFI, RPi3+ included. Need to install firmware though. Similar if you use Tow-boot on some Pine64 devices and there is a project for recent Rockchip boards. I have 2 Rockpro64s which I boot and installed the default ISO of Fedora Server from an ISO file on USB.