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Navigate to Startup → Commissioning → 'System Data' to verify if boot files exist in the system.

If boot files are not needed, simply acknowledge the alarm with RESET key and do not attempt to delete non-existent files.

If boot files should exist but are missing, create new boot files using 'Create Boot Files' function in the startup menu.

Creating boot files will capture current system configuration. Ensure machine is in proper state before proceeding.

After boot files are created, verify their presence in /siemens/sinumerik/hmi/cfg directory via service mode before attempting any delete operations.

Check the alarm detail text for the specific filename (%1 parameter) that is missing and note the complete path.

Search for references to this filename in active NC programs using 'Search' function in Program Manager (MPF, SPF directories).

Either restore the missing file from backup to the correct directory, or edit the calling program to remove/correct the invalid file reference.

Verify program logic after making changes to ensure machining process integrity.

Reset alarm, reload the corrected program, and test in single-block mode to verify proper file access.

Access Service Mode and navigate to the file system browser to verify the directory structure where the file should be located.

Service mode modifications can affect system stability. Document all changes.

Check if the expected directory path exists: verify /user/, /cma/, /oem/, or /addon/ directories depending on file type.

If directory structure is incorrect, restore from a known good backup or recreate standard directory structure per Siemens documentation.

Incorrect directory structure may indicate deeper system issues. Consider full system backup before modifications.

If problem persists after directory verification, perform a power cycle and check CompactFlash card integrity using built-in diagnostics.