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Navigate to the HMI file system directory: /user/sinumerik/hmi/template or /addon/plc directory and verify if *.plc files exist.

If files are missing, restore *.plc files from a known good backup to the correct HMI directory path.

Ensure backup compatibility with current software version to avoid additional errors.

If no backup available, re-commission the PLC masks using the original project files or HMI Advanced configuration tools.

Perform a complete HMI restart (power cycle the MMC/HMI) and verify alarm clears and PLC screens are accessible.

Check CompactFlash card integrity by reviewing HMI boot messages or running a file system check from Service mode.

Do not remove CF card while system is powered on - risk of further corruption.

If CF card errors are detected, create a backup image of current CF card content if possible using appropriate imaging tools.

Replace CompactFlash card with new card and restore from complete system backup including NCK, PLC, HMI, and all configuration files.

Use only Siemens-approved CF cards to ensure compatibility and reliability.

Verify all *.plc files are present in correct directories after restoration and perform full system restart.

Verify installed HMI software version matches the NCK and PLC software versions using Startup Tool or System Data display.

Check installation logs in /var/log or HMI diagnostic buffers for errors during last software update process.

Re-install HMI software package using correct version and ensure 'Complete Installation' option is selected to deploy all required files including PLC masks.

Document current machine data and parameters before reinstallation - some settings may require reconfiguration.

After successful installation, verify *.plc files exist in /user/sinumerik/hmi/template directory and clear alarm with system reboot.