EDIT: See ctrlX CORE Runtime, Release Notes XCR-V-0118 --> XCR-V-0118.3 --> New functions --> Automation Core --> "Feature 508496: ctrlX CORE X7 image update via "Rescue" system ". The function is the same for the X3.
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Please check the configuration of the port. I guess the setting "Use external settings" is enabled and so it cannot be done via this web interface.
Other possibility could be that a user is logged in with missing rights.
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Instead of a proprietary protocol the standard way of communicating to the data layer is REST. So you can use a standard http based request (including a valid web token) to read/write the values and execute functions.
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