Hello changle zhang,
Please see the following document for instructions on how to create a binary file with MCUXpresso:
MCUXpresso IDE: Creating Binary Files (S-Record, Intel Hex, Binary)
Refer to the Chapter 11 Over the Air Programming (OTAP) in the BLE Application Developer's Guide.pdf document for information on BLE OTAP and instructions on how to add this functionality to an application.
Currently in MCUXpresso, the BLE OTAP client example doesn't use linker symbols and instead it uses a custom linker file "MKW41Z512xxx4_connectivity.ld" with support for OTAP.
Let me know if you have any question.
Regards,
