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Step 1. Setup TYPO3 v11 with your existing database & files Step 2. Now you need to migrate gridelements to container for this you need to follow this step

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Migrate from EXT.gridelements to EXT.container

Latest version of TYPO3 templates products have major breaking changes to migrate from outdated EXT.gridelements to modern EXT.container. Please take a look at the step-by-step migration guide below. Step 1. Go to NITSAN > License Manager > Update to latest version of EXT.ns_theme_name Step 2. Update EXT.ns_basetheme atleast version Step 3. Go to Admin Tools > Maintenance module > Clear cache. Also, click on the “Dump Autoload” button. Or run the below command for the composer-based TYPO3 instance.
Step 4. Install EXT.container extension Step 5. Go to Admin Tools > Upgrade > Click on “Run Upgrade Wizard” Step 6. Click on the “Execute” button of “Grid to Container Migration” typo3_dumpautoload typo3_upgrade_wizard migrate_gridelement_to_container Step 7. Go to Admin Tools > Extensions > De-activate & Delete EXT.gridelements Step 8. Go to Admin Tools > Maintenance > Clear Cache. That’s it! All the grids are migrated (structure and data) from EXT.gridelements to EXT.container TYPO3 extension.

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After Migration follow below step for Upgrade v12

Step 1. Export the full database after the migration. Step 2. Set up fresh TYPO3 v12 and import the database. Step 3. Activate the template using a license key.

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

migrate_gridelement_to_container From version 13.1.0 onwards, this product introduces major changes by migrating from outdated FlexForm-based elements to modern Content Blocks (EXT).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 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:
Before running the Upgrade Wizard, please ensure that you create a backup of your database.
  1. Go to Admin Tools → Upgrade and click Run Upgrade Wizard.
  2. Click the Execute button for theme: Content Block Migration.
After completing these steps, all Custom Elements (structure and data) will be successfully migrated from FlexForm Elements to Content Blocks (EXT).