angularjs checked box in form

I want to when edit user to fill all field in form automatically. I managed to fill input and select fields, but don't know how to do that with checkbox, to be checked if they need to be checked. As a matter of fact I did but after a few days that solution stopped working even nothing has changed. I wrote my code in this way: html

<label><input type="checkbox" value="1" name="admin" ng-model="userDataCtr.user.admin"  ng-checked="userDataCtr.user.admin">ROLE_CRO</label>

And value of userDataCtr.user.admin is 1, but checkbox isn't checked. I tried with integer, string, but nothing happened.

Does anyone can help me?

Thanks