I used this youtube tutorial: https://youtu.be/QbLIDireUSg

Important notes:
Cahnge settings.php permissions from 444 to 777 before making changes (and then change back)

set the data base name, data base user and data base user's password

$databases['default']['default'] = array (
  'database' => '',
  'username' => '',
  'password' => '',
  'prefix' => '',
  'host' => 'localhost',
  'port' => '3306',
  'namespace' => 'Drupal\\Core\\Database\\Driver\\mysql',
  'driver' => 'mysql',
);

set trusted_host_patterns:

// set  trusted_host_patterns (on production server, replace 'example.com' with domain name)
$settings['trusted_host_patterns'] = [
  '^www\.example\.com$',
  '^example\.com$',
  '^localhost$'
];

Maybe (requirde in manual update):
set update_free_access to True and Then back to False

$settings['update_free_access'] = FALSE;