The different files are intended for use in the following masters:
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*.x41 for HMS 8-bit standard master
*.x42 for ABB Satt (Alfa Laval) 16-bit master 
*.x43 for Omron 8-bit master
*.x44 for ABB_Satt (Alfa Laval) 16-bit master with Comli
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Perform the firmware upgrade with the option "Online->Firmware Download" 
in the HMS SyCon configurator.
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