Secure DFU bootloader Signature fails

[KSV]

I can successfully download an image using nrfutil dfu serial when I use a test image compiling the bootloader with the Nordic default public key.

I cannot successfully download an image using nrfutil dfu serial when I generate an image using a generated key, compiling the bootloader with the generated public key.

Ubuntu Linux 16.04.6 LTS

S132 SoftDevice v6.1.1

Nordic SDK v15.3.0

The error that I receive:

Signature failed (err_code: 0x8542)

I get err = 0x8542  (NRF_ERROR_CRYPTO_ECDSA_INVALID_SIGNATURE)

in nrf_crypto_backend_micro_ecc_verify() in the file micro_ecc_backend_ecdsa.c

[KSV]

nRF Util v6.0.0a0

In the link below, it seems to indicate that nrfutil v6.0.0a1 is generating the key incorrectly. Is this also true of v6.0.0a0?

https://devzone.nordicsemi.com/f/nordic-q-a/54202/error-of-invalid_object-when-using-nrf-connect-desktop-after-generating-dfu-zip-file-with-new-keys

Do I need to change to nrfutil version 5.2.0?

[bjorn-spockeli]

Yes, this a bug with the v6.x.x version of nrfutil, see https://github.com/NordicSemiconductor/pc-nrfutil/issues/289. Please use the v5.2.0 version found under https://github.com/NordicSemiconductor/pc-nrfutil/releases.

[KSV]

Version 6.0.0 has the "Signature fails" error because of the bug in generating keys.

However, with v6.0.0 I can successfully download the test image hrs_application_s132.zip - How does that work?

I tried v5.2.0, but it fails with "TypeError: can only concatenate list (not "map") to list"

Where to go from here?