Why does nrf5340 not detect Bluetooth when adding CONFIG_NRF53_UPGRADE_NETWORK_CORE=y to the prj.conf file?

Question

Hello! I am using nrf5340 raytak internal quartz board and no DC-DC (zephyr sdk v2.4.2 ), I use heartrate example code and add config OTA DFU Non-simultaneous update by ( https://github.com/hellesvik- nordic/samples_for_nrf_connect_sdk/tree/main) cannot enable bluetooth Here is the code I tested 
 refer to OTA DFU Non-simultaneous update 
 Best Regard!

Dinh Son · Accepted Answer

build/hci_rpmsg/zephyr/.config 
 disable CONFIG_NRF53_UPGRADE_NETWORK_CORE 
 enable CONFIG_NRF53_UPGRADE_NETWORK_CORE 
 build/zephyr/.config 
 disable CONFIG_NRF53_UPGRADE_NETWORK_CORE 
 enable CONFIG_NRF53_UPGRADE_NETWORK_CORE 
 After enabling CONFIG_NRF53_UPGRADE_NETWORK_CORE, there is a difference in build/zephyr/.config with the following additional files net_core_app_update.bin net_core_app_signed.hex net_core_app_test_update.hex net_core_app_to_sign.bin When disabling CONFIG_NRF53_UPGRADE_NETWORK_CORE, the above files will not be generated (so it is not possible to OTA DFU core network, only OTA DFU core application) 
 After enabling CONFIG_NRF53_UPGRADE_NETWORK_CORE, /hci_rpmsg/zephyr/.config has the following files: signed_by_b0_app.bin signed_by_b0_app.hex When disabling CONFIG_NRF53_UPGRADE_NETWORK_CORE, the above files will not be generated.

Why does nrf5340 not detect Bluetooth when adding CONFIG_NRF53_UPGRADE_NETWORK_CORE=y to the prj.conf file?

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