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What causes error "Unknown header in the file:" when downloading Unity firmware?

Issue:
   Dowloading Unity copro or executive firmware displays error.

Resolution:  
         If flashing the CoPro firmware, make sure you are using FTP protocol.
         If NOE, use FTP protocol.
         Is the .bin file correct for the PLC type?
         Make sure the .bin file is on the desktop or a folder on the PC.
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