https://devzone.nordicsemi.com/f/nordic-q-a/15782/linux-upgrade-on-my-pc-broke-bluetooth-apps-on-nordicHi there, I have two nRF52 Preview DK boards, SDK 0.9.1 and 0.9.2, and SoftDevice S132 1.0.0-3 alpha. Several months back I got the Bluetooth heart rate demo from SDK 0.9.1 to run, using one board as the peripheral and one as the central. I haven&#39;ten-USTelligent Community 13Thu, 18 Aug 2016 23:27:42 GMThttps://devzone.nordicsemi.com/thread/60238?ContentTypeID=1Thu, 18 Aug 2016 23:27:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:56b504ae-1ee9-4404-b4c5-8745ae2d8691Ladasky<p>Well, I seem to have solved my problem, although I don&#39;t know exactly WHY I had to do what I did.</p> <p>After many frustrating attempts, I discovered that if I invoke the &quot;erase&quot; command from JLink before flashing the board, Bluetooth applications are working again.</p> <p>I was also able to flash ble_app_heart over ble_app_template at memory location 0x1F000, and on rebooting, the board was running the heart rate app. Previously, I thought that I was unable to do this. See above.</p> <p>What exactly is going on with JLink? What sections of memory are erased on executing a loadfile command? Why doesn&#39;t loadfile seem to erase something critical to the operation of SoftDevice? What does a full erase do that loadfile does not? If anyone understands, please feel free to chime in. Thanks!</p><div style="clear:both;"></div>