can't use usb boot after .hex file written to dongle

can't use usb boot after .hex file written to donglehttps://devzone.nordicsemi.com/f/nordic-q-a/93567/can-t-use-usb-boot-after-hex-file-written-to-dongle-- I am using Laird's bl654 dongle. If you download a hex file using nrfConnect for Desktop, the dongle is no longer recognized. It works like open bootloader again only when the reset button is pressed. I don't know why this is happening, as it isen-USTelligent Community 13Fri, 04 Nov 2022 09:14:18 GMTRE: can't use usb boot after .hex file written to donglehttps://devzone.nordicsemi.com/thread/394083?ContentTypeID=1Fri, 04 Nov 2022 09:14:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:62cdb4cb-d939-40af-aba9-5b38662df69bVidar Berg<p>Hello,</p> <p>Does the application you are programming now include the <span><a title="DFU Trigger Library (USB)" href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_dfu_trigger_usb.html?cp=8_1_3_5_3">DFU Trigger Library (USB)</a>? Without this library, the only way you can put the dongle in DFU mode is by pressing the reset button.</span></p> <p><span>Best regards,</span></p> <p><span>Vidar</span></p><div style="clear:both;"></div>