Hello @rahul-thanki and welcome to the ST Community.
For the STM32WBA series, I suggest you to follow the recommandations of this wiki. Also, you may find helpful the OTA examples BLE_p2pServer_ota. and BLE_HeartRate_ota (developed on the NUCLEO-WBA55CG).
PS: the same 2 examples are available on the STM32CubeWBA V1.1.0 for the NUCLEO-WAB52CG that is not a recommended for new design boards. That is why no more example on the SDK updates for this evaluation board.
Best Regards.
STTwo-32
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