This is a tracking bug for Change: Register EC2 Cloud Images with uefi-preferred AMI flag For more details, see: https://fedoraproject.org/wiki/Changes/CloudEC2UEFIPreferred A new feature of EC2 is to be able to register AMIs with a boot mode of uefi-preferred rather than picking one of bios or uefi. In EC2, aarch64 has always been UEFI, while x86-64 started out as BIOS only and some instance types have recently begun to support booting in UEFI mode. Previously, an AMI had to pick if it was UEFI or BIOS. With uefi-preferred it allows an AMI to launch with whatever firmware stack is available for the instance type, preferring UEFI when UEFI is an option. If you encounter a bug related to this Change, please do not comment here. Instead create a new bug and set it to block this bug.