https://devzone.nordicsemi.com/f/nordic-q-a/100051/dfu-bootloader-not-identified-correctly-in-nrf-connect-for-desktop-programmerHi, I want to use the DFU open bootloader with my nRF52840 device. When I send the bootloader hex file to the microcontroller and then I open the nRF connect for Windows &gt; Programmer app the device is identified as as 2.4G Keyboard Mouse insteaden-USTelligent Community 13Wed, 24 May 2023 14:22:53 GMThttps://devzone.nordicsemi.com/thread/427276?ContentTypeID=1Wed, 24 May 2023 14:22:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b8d4e6ed-70fb-47df-ae0d-e953d25e2e9emasterLee<p>Fixed it...<br />I tried it as you said to another PC and all the custom devices I tested were identified as open bootloader (as expected) once I pressed the reset button. The issue originated from my wireless mouse. Somehow(!!!) it interfered with the custom devices and they were identified as wireless mice. The moment I removed the mouse adapter from the usb hub of the PC and put it to another usb connector, everything was fixed.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/427219?ContentTypeID=1Wed, 24 May 2023 12:05:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3e78aa8e-1555-4669-92fc-135872aae957masterLee<p>yes I can Install it. Give me a sec please</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/427216?ContentTypeID=1Wed, 24 May 2023 11:58:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5f0a4982-301c-4dfe-bc8f-88d7ca6ef799Vidar Berg<p>Do you have another PC you can test this on to try narrow down the problem? </p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/427212?ContentTypeID=1Wed, 24 May 2023 11:55:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5e6908f6-d10a-43b9-ace3-eab95fd47158masterLee<p>Yes I have upgraded the programmer to v3.0.8. Still nothing with this specific custom board<br />Also, I programmed a second custom board&nbsp; (same to the first one) and the bootloader is identified correctly. It is the same hex file and the same build.&nbsp; No unfortunately I don&#39;t have a dongle at the moment.<br /><br />In device manager both devices are identified as nRF52 SDFU USB but in the programmer app, the first is identified as 2.4G Keyboard Mouse and the second is identified as open bootloader as expected.&nbsp; What is going on here :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/427195?ContentTypeID=1Wed, 24 May 2023 11:21:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:143ade25-a7ba-4a32-90dd-b6aac168e19aVidar Berg<p>Hi,</p> <p>Please try to upgrade the Programmer app to the current version (v3.0.8) and see if you get the same result. Also, is this 52840 device a custom board, or are you using the 52840 Dongle? If it is a custom board, do you have a dongle you can test with?</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>