https://devzone.nordicsemi.com/f/nordic-q-a/107110/cannot-recover-nrf52840-usb-dongle-pca10059Two of mine nRF52840 USB Dongle suddenly stop working. I am trying to flash it via nRF52840 DK (v 2.1.0), Starting with recover command: I tried flashing it using different DK, nrfconnect, on different PC - nothing worked for me. On two different Donglesen-USTelligent Community 13Fri, 05 Jan 2024 08:42:36 GMThttps://devzone.nordicsemi.com/thread/462824?ContentTypeID=1Fri, 05 Jan 2024 08:42:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:187401f1-1152-4709-a8e4-728b12ee5c10Edvin<p>Hello,</p> <p>Yes, the nRF52840 dongles has a bootloader that sets the regout voltage correctly, according to it&#39;s pcb layout. Please see:</p> <p>&nbsp;<a href="https://devzone.nordicsemi.com/guides/short-range-guides/b/getting-started/posts/nrf52840-dongle-programming-tutorial">nRF52840 Dongle Programming Tutorial</a>&nbsp;</p> <p>The section &quot;Using an external debugger&quot; is particularly relevant.</p> <p>So if the UICR is erased (either due to an erase or a recovery), then you either need a JLink Pro or you need to modify the hardware on the dongle (cutting solder bridges).&nbsp;</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>