https://devzone.nordicsemi.com/f/nordic-q-a/53871/segger-printfHi team, the problem is the following: i use secure bootloader project from examples of SDK, when i try to replace NRF_LOG_INFO() statement to printf() and try to debug the project (F5) the program crashed. What i am doing wrong? Is it possible to logen-USTelligent Community 13Thu, 31 Oct 2019 12:21:06 GMThttps://devzone.nordicsemi.com/thread/217754?ContentTypeID=1Thu, 31 Oct 2019 12:21:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:58249e57-7e85-4cb4-8719-1fc969620275bjorn-spockeli<p>Hi Vasa,&nbsp;</p> <p>if you wish to log from the bootloader then you should use the dedicated debug examples, e.g. &lt;SDK folder&gt;\examples\dfu\secure_bootloader\pca10056_s140_ble_debug for the nRF52840 bootloader. The non-debug examples have logging disabled in order to optimize them for size.&nbsp;</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>