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Cannot put OpenSDA into bootloader mode

In order to update the OpenSDA J-Link firmware on this board, OpenSDA has to be put into bootloader mode by keeping the reset button pressed when powering up the board. Some users experienced the issue that OpenSDA does not enter bootloader mode on this board, even if the reset button is kept pressed.

This is caused by an incorrect configuration of J24 which is right next to the micro USB connector. This jumper has to be in the position 1-2 closed, where the factory default on some FRDM-KW41Z boards seems to be 2-3 closed. FRDM-KW41Z J24.png