Secure DFU on Thing52

RE: Secure DFU on Thing52

Jared — Fri, 16 Feb 2018 21:17:54 GMT

Important to know. Thanks Vidar Berg

RE: Secure DFU on Thing52

Vidar Berg — Sat, 10 Feb 2018 11:50:35 GMT

Ok, thanks for the update. It looks like you did everything correctly apart from the wrong version number. Since you are already migrating to SDK 14, recommend to use v14.1.0 as it includes a fix for a bug the prevented DFU of larger softdevices, see this thread for more details.

RE: Secure DFU on Thing52

Jared — Thu, 08 Feb 2018 20:07:51 GMT

I did give that a try as well. No dice. I ended up leaning towards just converting the existing code to SDK14 as the bootloader/DFU setup is in a better state there.

RE: Secure DFU on Thing52

Vidar Berg — Mon, 05 Feb 2018 15:40:25 GMT

Hi,

The new application FW needs to have a higher version number. Otherwise the bootloader will reject the update. Please try to set --application-version to '1' and see if you get the same result.

dfu_req_handling.c

static nrf_dfu_res_code_t dfu_handle_prevalidate(dfu_signed_command_t const * p_command, pb_istream_t * p_stream, uint8_t * p_init_cmd, uint32_t init_cmd_len)
{ 
   ...
   switch (p_init->type)
    {
        case DFU_FW_TYPE_APPLICATION:
            if (p_init->fw_version < fw_version)
            {
                NRF_LOG_ERROR("FW version too low\r\n");
                return ext_error_set(NRF_DFU_EXT_ERROR_FW_VERSION_FAILURE);
            }
        break;
        ...