Problem with nrfutil (Response Code InvalidObject)

[Norbert Towianski]

I have problem with ble dfu update using zip package with hex + init file via nrfutil. I am getting error Invalid Object when I am trying invoke command 
nrfutil dfu ble -ic NRF52 -pkg app.zip -p COM22 -n "DfuTest" -f  

I have connected NRF52 DK (NRF52840) to COM22 and second custom board with NRF52832. When I am downloading code with prepared zip package by Nordic (bootloader_secure_ble_debug_with_bonds_s132.zip) everything is ok (both NRF Connect and nrfutil dfu).  

Steps to generate zip file and ota dfu:

1. Pogram my custom board with nrf52832 via openocd s132_nrf52_6.1.1_softdevice.hex
2. Program my custom board with nrf52832 via openocd bootloader_secure_ble_debug_without_bonds_s132.hex.
3. Generate private key: nrfutil keys generate private.pem
4. Generate zip file: nrfutil pkg generate --hw-version 52 --sd-req 0xAF --application bootloader_secure_ble_debug_without_bonds_s132.hex --application-version 4 --key-file private.pem app.zip
5. Then download code via BLE: nrfutil dfu ble -ic NRF52 -pkg hrs_application_s132.zip -p COM22 -n "DfuTest" -f
6. I am getting error Invalid Object. 

As I wrote everything is ok if I use zip file prepared by Nordic in secure_dfu_test_images folder in SDK.

I am using Python version 2.7.13.

[tesc]

Hi,

When you build a zip file with your own private key, you must also build the bootloader with the public key corresponding to that private key. Otherwise the checking of the signature of the update will fail. See step 1 of the Testing section of the BLE Secure DFU Bootloader documentation for details.

Regards,
Terje

[Norbert Towianski]

Ok, now everything works. I builded bootloader using public key generated from previously generated private key and I programmed my custom board. Then I had to generate zip file (command above is correct except sd-req (SD S132 6.1.1 has sd-req 0xB7). In the end I downloaded zip file via BLE DFU OTA.

Thanks for quick reply.  

[tesc]

Hi,

I am happy to hear that you got it to work!

Regards,
Terje