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What can I do when I get "error writing file" when flashing M241/258 firmware with Controller Assistant ?

It may happen that following error popup appears when flashing M241/M251 firmware with Controller Assistant :

A reason could be that Controller Assistant is not able to switch PLC to STOP before accessing files.

To be sure not to get this error you can stop the PLC using the RUN/STOP switch before starting firmware update.
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