Root volume replacement work restoration

Hello.

Does the root volume from before replacement remain?
In that case, I think you can restore it to its original state by reattaching the root volume using the steps in the document below.
https://docs.aws.amazon.com/ebs/latest/userguide/ebs-attaching-volume.html

If a snapshot of the original root volume remains, it may be possible to restore it using the steps in the document below.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/replace-root.html#replace