Reset password failed: A Super Administrator can’t request a password reminder. Please contact another Super Administrator or use an alternative method.

Open the file reset.php which is located under the components/com_users/models/reset.php directory.

Comment out lines 340-343 in that file by adding /* at the beginning of line 340 and */ at the end of line 343. So these lines will look like the following:

/* if ($user->authorise('core.admin')) {
$this->setError(JText::_('COM_USERS_REMIND_SUPERADMIN_ERROR'));
return false;
}*/

Save the file reset.php and upload it back.

Try to reset your password using a password reminder (it’ll work).