How to downgrade flutter?

You can downgrade using following setups:

Git Hub Source Code: 

Flutter is versioned using git. Changing the Flutter version is as simple as changing git branch.

Using Flutter Channel:

flutter channel <branch> (example: flutter channel stable)

This command is used to change between branches – usually stable/dev/beta/master. We can also put a specific commit id from git.

Flutter Downgrade Command:

flutter downgrade <version> (example: flutter downgrade v1.22.6)

This command will use a specific version number. You can have the list of the available version numbers using flutter downgrade or here

Then run  flutter doctor and Flutter will take care of downloading/compiling everything required to run this version.