DFU 14.2-15.2 (BL+SD+App)

Question

Hi, 
 I have migrated my projekt from SDK 14.2 to 15.2, the bootloader is basically the secure_bootloader example with some tiny adjustments. When I try to upgrade my product running on 14.2 and the old Softdevice I get the this message in nRF Connect: 
 " DFU failed with error: When writing 'EXECUTE' command to Control Point Characteristic of DFU Target: Operation code 4 (EXECUTE) failed on DFU Target. Result code 5 (INVALID_OBJECT)." 
 The DFU package is generated like this: 
 nrfutil pkg generate --hw-version 10100 --application-version 1 --application _build_debug/app.hex --bootloader-version 3 --bootloader ../Bootloader/_build_EP1/bootloader_nrf52832_xxaa_s132.hex --softdevice ../SDK/components/softdevice/s132/hex/s132_nrf52_6.1.0_softdevice.hex --sd-id 0xAF,0xBF --sd-req 0x9D,0xA5,0xAF,0xB7 --key-file ../private.key bl_sd_app.zip 
 And the bootloader settings for the application using the old Softdevice and SDK is generated like this: 
 $(OUTPUT_DIRECTORY)/bootloader_settings.hex: $(TARGET_HEX)
	$(NRFUTIL) settings generate \
 --family NRF52 \
 --application $< \
 --application-version 0 \
 --bootloader-version 1 \
 --bl-settings-version 1 \
 $@

Are there any obvious reason this shouldn't work? 
 
 DFU works on the old bootloader for upgrading the application (but of course not to our new migrated application) and BL+SD+APP upgrades work on the bootloader running on 15.2. 
 nRF Connect has version v2.6.2 (and the BLE app 2.2.0). 
 BR Henrik

AndreasF · Accepted Answer

Hi again Henrik. Thanks for the clarification :-) I have ran a test now, with success. Can you try to follow this procedure? 1. Create a key.pem file . Use the command nrfutil keys display --key pk --format code private.pem To display it on a code format and paste this code into the dfu_public_key.c file in both SDK 14.2 and SDK 15.2 2. Build the bootloader in SDK 14.2 with the dfu_public_key.c file in use. Build the bootloader in SDK 15.2 with the same dfu_public_key.c file in use. 3. Generate the DFU package with the following command: nrfutil pkg generate --hw-version 52 --sd-req 0x9D,0xAF --application-version 1 --application .hex --softdevice .hex --bootloader .hex --bootloader-version 2 --sd-id 0xAF --key-file priv.pem dfu_package.zip Where you change .hex, .hex, and .hex with the correct file names. 4. Flash 1 device with the bootloader from SDK 14.2 and SoftDevice S132 5.0.0 and reset the device. Open the nRF Connect BLE Application and Connect to the "DfuTarg" (or what name you have given to the bootloader) And select the .zip file . First the SoftDevice and Bootloader are transferred: Then the Application, and here you can see that the transfer was a success: Best regards, Andreas

DFU 14.2->15.2 (BL+SD+App)

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