Hi,
in ocs db > operators table > passwd column
> Replace user's value for default password (admin) :
$2y$10$1HpmlSx7CW/nitCCSM5h.Od6m/C8Go2xoPzISnt0jnXKkoM3vFhLi
>> Log to the GUI with user name and password 'admin' > Configuration > Users then enter the new desired password for the user ;-)