Troubleshoot Model Upgrade and Obsolete Blocks

When building Simulink Real-Time models from previous releases in R2026a and later releases, build errors can occur. Some of the blocks in the model have the label Obsolete Simulink Real-Time Block.

What This Issue Means

For R2025b and previous releases, you must upgrade the Simulink Real-Time model. A model Upgrade Advisor check is available to support this upgrade.

Try This Workaround

To upgrade your model for Simulink Real-Time features, use this software upgrade process:

1. Install Simulink Real-Time and other required products.

2. ​Install the Speedgoat I/O Blockset. Go to the Speedgoat customer portal.

3. Upgrade the target machine software. See Troubleshoot System Upgrade.

4. Open a Simulink Real-Time model from a previous release.

5. Run the Upgrade Advisor. On the Modeling tab, select Model Advisor > Upgrade Advisor.

6. In the Upgrade Advisor dialog box, select Check model for upgradable Simulink Real-Time features. Click the Run This Check button. The advisor lists the upgrades that it can apply and the upgrades that require manual changes.

7. After the check, click the Upgrade button. The advisor upgrades the model by applying all nonmanual changes.

Apply Manual Changes

When the Upgrade Advisor encounters model issues that it cannot resolve by using automated changes, the Upgrade Advisor reports these as Warning: Some of the features require manual changes. It is a good practice to copy the text of these warnings and save it for reference as you apply changes to your model.