Issue with backbutton in NavBar?

ionic-v1
1

I am not able to display the back button, its not working.
I am using ionic - 0.9.27

few minutes back it was working, then i tried to upgrade my library to beta version, there i was seeing lot of errors, so I switched back to .27 using bower.

Now the back button is not working.

Also i am not able to inject $ionicNavBarDelegate service, it throws Unknown provider: $ionicNavBarDelegateProvider <- $ionicNavBarDelegate

2

$ionicNavBarDelegate is only available in 1.0-beta+.

Here is a migration guide for beta: https://github.com/driftyco/ionic/blob/master/CHANGELOG.md#breaking-changes--migration-guide