> ## Documentation Index
> Fetch the complete documentation index at: https://docs.t3planet.de/en/latest/llms.txt
> Use this file to discover all available pages before exploring further.

# Migration Guide:FlexForm to Content Block

> Migration Guide:FlexForm to Content Block.

<div className="t3-embed">
  <iframe src="https://app.supademo.com/embed/cmpf1zpbo2ciaqm8q3ng5amnj?preview=true&step=1" loading="lazy" title="Demo" allow="clipboard-write; fullscreen" frameBorder="0" webkitallowfullscreen="true" mozallowfullscreen="true" allowfullscreen />
</div>

## Upgrade Product ≥ v13.1.0 (Migration from FlexForm Elements to Content Blocks)

From version **13.1.0** onwards, this product introduces major changes by migrating from outdated **FlexForm-based elements** to modern **Content Blocks (EXT)**. Please follow the step-by-step migration guide below.

1. Go to **Admin Tools → T3planet License** and update **T3Bootstrap Theme (EXT)** to the latest version.
2. Make sure the **Content Blocks extension (EXT)** is installed, as it is required for this migration.
3. Go to **Admin Tools → Maintenance** module and clear the cache. Also, click on the **Dump Autoload** button.
   For composer-based TYPO3 installations, run the following command:

```bash theme={"theme":{"light":"github-light","dark":"github-dark"}}
composer dump-autoload
```

<Warning>
  Before running the **Upgrade Wizard**, please ensure that you create a **backup of your database**.
</Warning>

1. Go to **Admin Tools → Upgrade** and click **Run Upgrade Wizard**.
2. Click the **Execute** button for **T3Bootstrap: Content Block Migration**.

After completing these steps, all **Custom Elements (structure and data)** will be successfully migrated from **FlexForm Elements** to **Content Blocks (EXT)**.