Adding Salesforce Users via Data Loader and Reset the Password
following setps to reset the password after loading the users using apex data loader without any coding:
1. Load the Users Using Apex Data Loader
2. Go to Manage Users which lists out all of the users in the system.
3. Create a New view based on the created date Today.
4. Check all of those users’ checkboxes (can also check the ‘Action’ checkbox in the header to select all).
5. Click the Reset Password(s) button.