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To update the user status on Flutter with Firebase, an admin can follow these steps:

1. Create a Firebase project and enable Firebase Authentication.
2. Set up the admin access by creating a new user in the Firebase Console and determine the admin role.
3. In Flutter, implement the Firebase Authentication package and enable the necessary Authentication methods for the user status to be updated.
4. In the admin panel, retrieve user data from Firebase by querying the users collection.
5. Update the user's status by modifying the corresponding field in the user document.
6. Save the changes to Firebase using the Firestore database package in Flutter.

Here's a sample code snippet for updating the user status in Firestore using Flutter:

import 'package:firebase_auth/firebase_auth.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

// assume the user document contains a field named 'status'
void updateUserStatus(String userId, String status) async {
  var admin = FirebaseAuth.instance.currentUser;
  var userCollection = FirebaseFirestore.instance.collection('users');

  // check if the admin is authorized to update user status
  if (admin != null && admin.uid == 'admin_uid') {
    await userCollection.doc(userId).update({'status': status});
    print('User status updated successfully.');
  }
  else {
    print('Unauthorized access.');
  }
}

Note that this code assumes the admin user ID is hardcoded as 'admin_uid'. In a real-world scenario, the admin user ID should be obtained through secure authentication methods to prevent unauthorized access.