If you break or damage something, the common term is then 'I fixed it'. 'Restore' is a less common term, often used in an artistic context, eg restore a damaged painting or a antique chair. After we fix something, we often say flippantly 'Now it's as good as new '.
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onizoIs 'undo' the proper one ... ?You can't use "undo" to mean "fix". No. That's impossible.