https://devzone.nordicsemi.com/f/nordic-q-a/103945/unable-to-flash-or-debug-with-j-linkHardware: nrf52840 Seeed Xiao BLE Sense connected to a segger J-link probe Host OS: Ubuntu 20.04 LTS Connect SDK setup is done. I am able to build firmware files and also upload them using other methods such as the DFU bootloader and using OpenOCDen-USTelligent Community 13Wed, 20 Sep 2023 12:46:55 GMThttps://devzone.nordicsemi.com/thread/446885?ContentTypeID=1Wed, 20 Sep 2023 12:46:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b8083986-3393-414a-a5e0-a003a2e22d9aAloysious Benoy<p>Thank you, I&#39;ll close this ticket now!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/446881?ContentTypeID=1Wed, 20 Sep 2023 12:42:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:af609bce-5c7f-4099-be34-e51a23a2bb4eKenneth<p>There are things looking <span>suspicious here yes, look at the firmware date also that says 2014:</span></p> <p>[2023-Sept-19 22:05:17] [trace] [ JLink] - Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46<br />[2023-Sept-19 22:05:17] [trace] [ JLink] - Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46</p> <p>Check with SEGGER if you want to make sure.</p> <p>Kenneth</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/446878?ContentTypeID=1Wed, 20 Sep 2023 12:32:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b9f06f36-2765-45e0-bbad-156d49289163Aloysious Benoy<p>Is that the only reason why it does not work with the nrf tools? Is there some fix to this?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/446874?ContentTypeID=1Wed, 20 Sep 2023 12:28:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:247c8351-b5a3-4607-8129-af1f8449ed7fKenneth<p>Hello,</p> <p>Very much look like fake SEGGER j-link. You can contact them directly for support, but looking at the serial number and firmware date it looks like suspicious (e.g. serial number 4294967295 = 0xFFFFFFFF (in hex)).&nbsp;</p> <p>Kenneth</p><div style="clear:both;"></div>