How to rename a device permanently via iPhone?

We tried to use the setting function in the SDK to rename a device on iPhone, but after we renamed the device using a certain iPhone, we still see the name of BLE is also "MetaWear" with another iPhone.
We know there is a macro module that can change device name permanently, but we find out only C++,C#,Android have documents for this, we cannot find macro functions in iOS document.

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