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Once the download is complete, follow these steps to install the hardware support:

Updates the software catalog so you can select "V4.3" in your project configuration.

Which specific (e.g., V15.1, V16, V17) you are currently running. The exact article number (MLFB) of your S7-1200 CPU.

: Any existing S7-1200 V4 CPU (Article No. 6ES721x-1xx40-0XB0) can be updated to firmware V4.3. Key Features of Firmware V4.3

Click Add from file system and browse to the extracted *.isp file.

Re-download the zip file from the official Siemens portal if the file extraction fails.

Open any existing project, or create a blank dummy project to access the main menu.

Look at the panel or dropdown menu on the right. You should now see V4.3 listed under the available firmware versions. Troubleshooting Common Issues

The HSP0276 S7-1200 CPU V4.3 firmware offers several enhancements and new features, including:

If the workstation is offline or the automatic method fails, you can download the installer manually.