https://devzone.nordicsemi.com/f/nordic-q-a/9397/some-error-about-spi-clock-and-jlink-firmwair1: my nrf51 SDK board not work , I replace the USB control IC--ATSAM3U1C-AU(the old is ATSAM3U2CA-AU),can you send me the firmwair of JLINK with this IC and the contacted software 2: I use the demo code (nRF51_SDK_9.0.0_2e23562-NORDIC\nRF51_SDK_9.0.0_2e23562en-USTelligent Community 13Mon, 05 Oct 2015 09:23:58 GMThttps://devzone.nordicsemi.com/thread/34670?ContentTypeID=1Mon, 05 Oct 2015 09:23:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:70530538-7e50-4e8d-9a4c-86d8a2361f38Susheel Nuguru<p>your description is very unclear. Where did you find a bug and how did you verify this?</p><div style="clear:both;"></div>