I've updated my drupal installation and drupal modules, but admin/reports/updates says that Drupal version is still 6.12. To update drupal I ran - drush updatecode - drush updatedb (this updated only modules and said code still needs to be updated manually). Then I uploaded core, unzipped it, allowed to overwrite older versions and again ran - drush updatedb to enable changes. Still, admin/reports/status shows not 6.13 version as expected, but 6.12 and says core is not secure. I even ran update.php script in the end, but still core is displayed in red as well as modules located at admin/reports/updates.
Is using drupal shell (drush) a good practice for updates? Why is status still displayed as unupdated?