# Upgrade 2.1.0.1

1. Back up application files, database and storage.
2. Extract this ZIP into the Baltique OS root and overwrite files.
3. Sign in as `admin` or `superadmin`.
4. Open `/upgrade_2_1_0_1.php`.
5. Click **Uruchom naprawę 2.1.0.1**.
6. Open `/system_codebase_normalization.php` and `/system_runtime_preflight.php`.

You may also reopen `/upgrade_2_1_0.php`; after this patch that page invokes the combined 2.1.0 + 2.1.0.1 installer.