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The binary content of AMIs (meaning the disk content) is inherently immutable. You can't modify it bitwise; any changes require replacing the entire object which would also change the AMI ID. S3 also has built-in mechanisms that consistently verify the integrity of AMIs, across the many copies that are stored in S3.
So once the AMI is created then that content can't be changed: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/modify-ami.html
A limited set of attributes of an AMI can be changed after it is created - see the API docs for ModifyImageAttribute for details: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_ModifyImageAttribute.html
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