Hello @AkashJoseSaji and welcome to the ST Community :smiling_face_with_smiling_eyes:.
The stm32wb5x_BLE_Stack_full_fw.bin is the wireless stack that is ensuring the fluent work of the wireless capability of the MCU. You can't generate it throw CubeMX. You have to take it as a .bin and downloaded on the indicated address using CubeProgrammer.
Best Regards.
STTwo-32
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