Datasheet

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Is it possible to modify or disable the built in GATT services and characteristics (DIS, DFU, etc.)?

No, unfortunately you can't. We rely on the Device Information Service (DIS) contents to know which firmware and

bootloader version you are running, and wouldn't be able to provide firmware updates without being able to trust

this information, which i why it's both mandatory and read only.

Similarly, the DFU service is mandatory to maintain over the air updates and disabling it would create more problems

that it's presence would cause.