title: Can't edit CloudFormation stack after failed update?
body: <p>My CloudFormation stack seems to have exploded. I tried to make a quick change to resize the EC2 instances and the update failed with the error:</p>
  
  <pre><code>Invalid value 'm4.large' for instanceType. LaunchPlan instance type does not match attribute value m4.xlarge
  </code></pre>
  
  <p>The rollback also failed with error:</p>
  
  <pre><code>The following resource(s) failed to update: [TC2, TC1, TC3].
  </code></pre>
  
  <p>My only option when right-clicking the stack is to delete, and trying to continue the update by force through the actions menu yields:</p>
  
  <pre><code>This instance 'i-e5e8b063' is not in a state from which it can be stopped.
  </code></pre>
  
  <p>Looking at the EC2 Instance console, I can see that this message is at least true: All the instances are listed as terminated.</p>
  
  <p>All the suggestions here about what to do about a failed update seem to predicated on me actually being able to modify the stack to fix the error first, which I'm unable to do: <a href="http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/troubleshooting.html#troubleshooting-errors-update-rollback-failed" rel="noreferrer">http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/troubleshooting.html#troubleshooting-errors-update-rollback-failed</a></p>
  
  <p>Do I any recourse besides blowing away the stack and designing a new one from my backup? I'm at a total loss.</p>