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Or even better: Replace "Write To Text file"/"Read From Text File" with "Write To Binary File"/"Read From Binary File". The output of "Flatten to String" is not text. (String != Text)

Right-Click on the "Read From Text File" method and unselect "Convert EOL". The number "13" (0xD or Carriage Return) gives it away. If you look at the HEX representation of what you save and what you read from file, you'll notice the 0xD gets converted to 0xA unless you uncheck that box. Tip: If you deal exclusively with HEX/binary data, you might want to save it using byte arrays instead. The result will be the same in your file, but you won't get bitten by hidden config parameters in your node...