https://devzone.nordicsemi.com/f/nordic-q-a/70176/nrfjprog-over-usbI use usb with secure bootloader to flash 52833/840/832 boards. Is there a way to use the nrfjprog --memwr/rd over the usb after a DFU on USB upgrade to new app? Steps w/o DFU are as follows nrfjprog --recover make flash_softdevice make cleanen-USTelligent Community 13Thu, 07 Jan 2021 14:07:54 GMThttps://devzone.nordicsemi.com/thread/287972?ContentTypeID=1Thu, 07 Jan 2021 14:07:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e917d4f9-87fe-4dbe-a7c9-46aa97187679Hung Bui<p>Hi Stevie,&nbsp;</p> <p>I afraid what you are asking for is not possible.&nbsp;<br />nrfjprog only works with the SWD programming interface.&nbsp;</p> <p>What you got when you call nrfutil to download the .zip file via USB is the nrfutil talk to the bootloader to send the image via UART/USB to the bootloader and the bootloader replace the old image with the new image.&nbsp;<br /><br />You can, however, modify the bootloader so that it also accept a custom command to read out a place in flash and reply that via UART. But you would need to implement that and the application on PC to talk to the bootloader.&nbsp;</p><div style="clear:both;"></div>