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I want to insert a DFU module through BLE in my old ble project to upgrade my nrf5340 image

    i have look for many DFU examples in NCS1.5.0 , but samples are Abstract ,and can not to start . a ble test  app in phone have a menu that  can  send file to nrf5340 through ble ,  when ble of nrf5340 receive this file  ,file can as  a new image.

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