https://devzone.nordicsemi.com/f/nordic-q-a/64315/uart-dfu-hangs-on-windows-only-for-application-softdevice-bootloader-packageHello, I&#39;ve build a small utility around https://github.com/NordicSemiconductor/pc-nrfutil which pretty much exposes some arguments and forces the device to update to enter bootloader. Very simple stuff around calling this and passing over to pc-nrfutilen-USTelligent Community 13Fri, 31 Jul 2020 10:07:47 GMThttps://devzone.nordicsemi.com/thread/262539?ContentTypeID=1Fri, 31 Jul 2020 10:07:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:156125f1-3e2b-4828-8126-5182fc6af607Vidar Berg<p>Hello,</p> <p>Please try to increase the NRF_BL_DFU_CONTINUATION_TIMEOUT_MS in your bootloader to 40 seconds and see if helps. Or reduce the timeout as suggested in this thread: <a href="https://devzone.nordicsemi.com/f/nordic-q-a/55803/nrfutil-takes-34-seconds-before-starting-dfu">https://devzone.nordicsemi.com/f/nordic-q-a/55803/nrfutil-takes-34-seconds-before-starting-dfu</a> </p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/262218?ContentTypeID=1Wed, 29 Jul 2020 13:23:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:199e2334-c0e3-48ce-b0a8-15ddf4215975PB<p>After looking deeper into the pc-nrfutil code the DFU process gets stuck in this&nbsp;<a href="https://github.com/NordicSemiconductor/pc-nrfutil/blob/master/nordicsemi/dfu/dfu_transport_serial.py#L208">https://github.com/NordicSemiconductor/pc-nrfutil/blob/master/nordicsemi/dfu/dfu_transport_serial.py#L208</a>&nbsp;loop. Only on windows and only AP+SD+BL DFU before starting the second step though&nbsp;&macr;\_(ツ)_/&macr;</p><div style="clear:both;"></div>