https://devzone.nordicsemi.com/f/nordic-q-a/77932/nrf52840-not-detected-on-computer-after-entering-bootloader-modeWhile testing DFU for OTA ,after entering bootloader mode on my nRF52840 DK, the device doesnt show up either in the device manager or using nRFconnect and Jflash lite . when I turn the DK on and off normally (without pressing the reset button), the LD5en-USTelligent Community 13Wed, 28 Jul 2021 03:29:05 GMThttps://devzone.nordicsemi.com/thread/322122?ContentTypeID=1Wed, 28 Jul 2021 03:29:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:93923408-526d-4848-b5f7-a8550952a073sne_333<p>Yes this worked for me. Thank you so much :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/322087?ContentTypeID=1Tue, 27 Jul 2021 14:47:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:45767ce4-ca49-45d3-a807-8e6c8d51c72cJ&#248;rgen Holmefjord<p>Hi,</p> <p>If you have entered bootloader mode for the interface MCU, its firmware have been erased. You need to reflash the firmware in order to recover the board.</p> <p>The default Segger J-Link OB firmware can be found here:&nbsp;<a href="https://www.nordicsemi.com/-/media/Software-and-other-downloads/Dev-Kits/nRF5x-DK-files/J-Link-OB-SAM3U128-V2-NordicSemi-170724.bin">J-Link-OB-SAM3U128-V2-NordicSemi-170724.bin</a>&nbsp;</p> <p>The firmware is flashed to the board by entering bootloader mode (hold IF BOOT/RESET while powering board), then drop the binary to BOOTLODER drive. After a few seconds, you can unplug and replug the board and it should work like normal.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>