https://devzone.nordicsemi.com/f/nordic-q-a/15660/j-link-rtt-viewer-freeze-when-download-from-keilI connect to nrf51 DK board and PC using USB. I used RTT Viewer to see RTT log output. But when I try to compile and download from keil to the board, I got several WARNING and the RTT viewer is freezing. (see as follows..) I do not have any otheren-USTelligent Community 13Tue, 23 Aug 2016 01:03:47 GMThttps://devzone.nordicsemi.com/thread/59806?ContentTypeID=1Tue, 23 Aug 2016 01:03:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0b90b0dc-6752-4083-aaa3-01eb07ec99d6sosse<p>Still I don&#39;t know why the RTT viewer is freezing when I update J-Link F/W...Somebody have same issue?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/59805?ContentTypeID=1Wed, 10 Aug 2016 04:46:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e6b5d1da-687c-4079-88ad-ed8541863d92sosse<p>I answer myself... I figured it out. I don&#39;t know what is wrong with the newest version for J-Link F/W. From <a href="https://www.nordicsemi.com/eng/nordic/Products/nRF52-Preview-DK/nRF5x-DK-J-Link-IF/49235">this link</a>, version 160212 seems not works properly. Thank you.</p><div style="clear:both;"></div>