Create a package from another instance that includes the /home/users/a/admin (dev, staging, and so on) where you know the password. Download that package and copy it into crx-quickstart/install folder (create that folder if not existing). The package is installed and the user information updated, including the password.
The following command resets the password to default (admin). Make sure that AEM CQ isn't running. Also, make sure that you use the version of the jar that matches your CQ version.
java -jar resetadminpw-{cq55|cq56}-1.4.jar /path/to/crx-quickstart/repository
Change the password again for security reason once that is done.
تنزيل