RE: Bootloader initialization skip

Aleksander Nowakowski — Wed, 19 Jan 2022 13:32:31 GMT

Hello,

Flutter DFU library was made by a 3rd party based on our native libraries and we can't force them to update their API. However, that is not a problem, as you still can user the preferred ZIP file, which is supported. You just need to create it correctly.

From the log you provided I see that may have created your ZIP file using the latest nrfutil version. However, for nRF51 and the Legacy DFU you should use version 0.5.3 instead (https://github.com/NordicSemiconductor/pc-nrfutil/tree/0_5_3).Read more here: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrfutil%2FUG%2Fnrfutil%2Fnrfutil_intro.html and here: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v11.0.0/bledfu_example_image.html?cp=8_5_13_4_3_1_1_2.

Note: It is not possible to have both latest (for Secure DFU) and 0.5.3 at the same time unless you would rename the packages, as they overlap. You may list all available versions using:

pip index versions nrfutil

and to install 0.5.3 use:

pip install nrfutil=0.5.3