Hola, he hecho una instalación limpia de drupalbb 5.7.1 y en /admin/logs/status

dice: (X) Module update status Unsupported release
The installed version of at least one of your modules or themes is no longer supported. Upgrading or disabling is strongly recommended! Please see the project homepage for more details. See the available updates page for more information.

en /admin/logs/updates dice:

Update Status 5.x-2.2 Actualizado
Includes: Update status