title: How to downgrade Flutter SDK (Dart 1.x)
body: <p>I upgraded my Flutter SDK and now my project is broken. I need to basically revert back to a Flutter SDK which uses Dart 1.x.</p>
  
  <p>I tried the following in the pubspec.yaml, </p>
  
  <pre><code>environment:
    sdk: "&gt;=1.19.0 &lt;2.0.0"
    flutter: "^0.1.2"
  
  dependencies:
    flutter:
      sdk: flutter
  </code></pre>
  
  <p>but now the project just simply doesn't build.</p>
  
  <pre><code>Running "flutter packages get" in binformed...
  Package binformed requires Flutter SDK version ^0.1.2 but the current SDK is 0.2.5-pre.38.
  pub get failed (1)
  </code></pre>
  
  <p>Do i need to uninstall the SDK and reinstall it?</p>