https://devzone.nordicsemi.com/f/nordic-q-a/98309/unable-to-program-nrf-dongle-successful-through-nrf-connectI have two nrf 52840 Dongles, and I cannot program either of them: For the first piece, I have programmed it using conectivity_1.0.0_S132.hex a year ago. and it works well. I would like to use it as a ble sniffer some time later, but the chip is noten-USTelligent Community 13Fri, 31 Mar 2023 12:00:21 GMThttps://devzone.nordicsemi.com/thread/418574?ContentTypeID=1Fri, 31 Mar 2023 12:00:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0f4c48ec-b98b-497a-b42e-d5355a2bc29bEinar Thorsrud<p>Hi,</p> <p>The dongle does not have an onboard debugger, but instead it ships with a USB bootloader. So programming the dongle happens via USB DFU. However, except for a few application that has special support for it, the dongle needs to be explicitly put in DFU mode in order to be able to program it. This is done by pressing the reset button on the dongle, which is a sideways button marked &quot;RESET&quot;, which is right to the left of the &quot;SW1&quot; button. When you pres this, the LED with be pulsating red, indicating it is in DFU mode. Then you can add a file and write it. (It is not possible to select erase though, as that only works via a debugger.)</p> [quote user=""]I tried to press the reset button and then insert the chip into my computer (no usb hub used in any of the steps before). but it doesn&#39;t help.[/quote] <p>You must press the reset button while the dongle is plugged in the computer.</p> <p></p><div style="clear:both;"></div>