# UEFI Preferred and Secure Boot
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By default, any instances launched with the AL2023 AMI on instance types that support UEFI firmware will launch in UEFI mode. This is done by setting the Boot Mode AMI parameter to `uefi-preferred`. For more information, see [ Boot Modes](https://docs.amazonaws.cn/AWSEC2/latest/UserGuide/ami-boot.html) in the *Amazon EC2 User Guide*. 

 On Amazon EC2 instance types that support UEFI Secure Boot, it is possible to enable Secure Boot in Amazon Linux 2023. For more information, see [UEFI Secure Boot on AL2023](uefi-secure-boot.md).