Reset vtiger default admin password

UPDATE vtiger_users SET user_hash = ‘21232f297a57a5a743894a0e4a801fc3′,
user_password = ‘adpexzg3FUZAk’,
confirm_password = ‘adoY/6Mlw8kqg’ WHERE user_name = ‘admin’

This will set the admin password to ‘admin’ again.