Downgrading Flutter SDK to Version 1.x

% flutter downgrade v1.22.6

If you do this,

There is no previously recorded version for channel "stable".

an error message will appear, and you won't be able to downgrade.

To downgrade, you should perform a git checkout in the Flutter SDK directory

% cd <your-flutter-sdk-path>

% git fetch

% git tag
...
1.22.5
1.22.6
1.23.0-13.0.pre
1.23.0-18.0.pre
1.23.0-18.1.pre
...

% git branch -a
 dev
 master
 stable
...
 remotes/origin/flutter-1.27-candidate.5
 remotes/origin/flutter-1.27-candidate.6
 remotes/origin/flutter-1.27-candidate.7
 remotes/origin/flutter-1.27-candidate.8
 remotes/origin/flutter-1.27-candidate.9
 remotes/origin/flutter-2.2-candidate.0
 remotes/origin/flutter-2.2-candidate.1
 remotes/origin/flutter-2.2-candidate.10
 remotes/origin/flutter-2.2-candidate.11
...

% git checkout 1.22.6
HEAD is now at 9b2d32b605 [flutter_releases] Flutter Stable 1.22.6 Framework Cherrypicks (#74355)

% flutter doctor
...
...
[✓] Flutter (Channel unknown, 1.22.6, on macOS 11.4 20F71 darwin-x64, locale ja)