DFU Update OTA of an application with ble secure bootloader works only once

[boisi73]

Hi, I try to use the dfu update OTA with ble secure bootloader. If the Flash is erased and only the SD v5.0.0 and the own Bootloader are programmed a update OTA is working fine (using nrf Connect). After that, I tried to update the same APP.HEX file again and now the following error occurs:

[DFU] Remote DFU error: OPERATION FAILED

How can that be ???

Here my development environment:

GCC
NRF52
SDK14
SD5.0.0
Own ble_app_blinky (APP:HEX)
Own bootloader_secure_ble
Own private key

Thanks, Boris

[boisi73]

Here my workaround: In file nrf_dfu_flash.c

// original code //NRF_FSTORAGE_DEF(nrf_fstorage_t m_fs) = ......

// original code (decoded)
//nrf_fstorage_t m_fs attribute ((section( "." "fs_data"))) attribute((used)) = .....

// workaround code
nrf_fstorage_t m_fs =
{
.evt_handler = dfu_fstorage_evt_handler,
.start_addr = MBR_SIZE,
.end_addr = BOOTLOADER_SETTINGS_ADDRESS + CODE_PAGE_SIZE
};

I don't know why, but it works with this workaround.