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!
Hi,
When CONFIG_NRF53_UPGRADE_NETWORK_CORE=y is not enabled, BLE transmission can still work normally but cannot OTA DFU Non-simultaneous update core net work nrf5340 (due to not generating net_core_update.bin) only core application can be OTA (due to generating app_update.bin)
when I don't add CONFIG_NRF53_UPGRADE_NETWORK_CORE=y
when i add CONFIG_NRF53_UPGRADE_NETWORK_CORE=y
Regards,
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.
