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`flutter downgrade` fails if you haven't used `flutter upgrade`: ``` $ flutter downgrade There is no previously recorded version for channel "stable". ``` It's not clear what actions a user should take from this error message. Here's the new error message: ``` $ flutter downgrade It looks like you haven't run "flutter upgrade" on channel "stable". "flutter downgrade" undoes the last "flutter upgrade". To switch to a specific Flutter version, see: https://flutter.dev/to/switch-flutter-version ``` Depends on https://github.com/flutter/website/pull/11098