https://devzone.nordicsemi.com/f/nordic-q-a/62330/usb-hot-plug-device-crashesI used dfu_bootloader with integrated usb function to perform jump application test, and found that after the disk is mounted to the computer, if the device is not removed on the computer side, unplug the usb, the bootloader jumps to the application,en-USTelligent Community 13Tue, 09 Jun 2020 14:18:22 GMThttps://devzone.nordicsemi.com/thread/254069?ContentTypeID=1Tue, 09 Jun 2020 14:18:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cc7b8d5c-d96c-4b76-9d2a-003e1599df29Hung Bui<p>Hi Mars,</p> <p>I would need to have more information about your bootloader and your application. Please give more information on :&nbsp;</p> <p>- What would your bootloader do ? Which bootloader did you use? is it USB bootloader or BLE bootloader?&nbsp; I&#39;m not sure I fully understand what you meant by &quot;Unplug the usb, the bootloader jumps to the application and the jump will occur probalilistically&quot;</p> <p>- What would your application do ?&nbsp;</p> <p>Note that our USB bootloader for the PCA10059 automatically enter DFU mode if the device has a soft reset. So if you unplug USB cable and for some reason the application reset the chip then it will enter DFU mode.&nbsp;</p> <p>Please check if there is any assert when you unplug the USB cable without removing the disk.&nbsp;</p> <p>Please try to reproduce the issue on the PCA10056 DK so that we can test here.</p><div style="clear:both;"></div>