Update Hardware Version or Firmware Version

I have Temperature Sensor & Gateway that have Hardware Version 5.0 and Firmware Version 5.11
I need Modbus feature, but that feature only support for Hardware Version 5.1 and Firmware Version 7.20 or latter.
So how Hardware Version 5.0 can support Modbus? Or how to upgrade Hardware Version 5.0 into 5.1?

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