https://devzone.nordicsemi.com/f/nordic-q-a/64107/nrfconnect-unable-to-read-board--nrf52840-dk-to-flash-dataHello, My nrfConnect programmer is unable to read anything from my board. It is giving me this error message- Could not fetch memory size of target devkit: Error: Error occured when get library info. Errorcode: CouldNotOpenDevice (0x4) Lowlevel erroren-USTelligent Community 13Fri, 31 Jul 2020 11:18:47 GMThttps://devzone.nordicsemi.com/thread/262549?ContentTypeID=1Fri, 31 Jul 2020 11:18:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ac283cdb-3042-4e69-b533-33877b3ca8a0Heidi<p>Hi, it looks like you&#39;re using the PPK? Could you please make a new ticket for this issue.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/262455?ContentTypeID=1Thu, 30 Jul 2020 15:02:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e8af353f-e04c-4a0e-9621-0b2960f6a67aRonny L<p>My MacBook has the same problem with JLink Version: JLinkARM.dll version: 6.50b</p> <p>My Windows 10 PC has JLink Version: JLinkARM.dll version: 6.82b with the Error: PPK command failed after activating Average Start ( Measurement start ).</p> <p>Any advise?</p> <p></p> <p>Ronny</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/261591?ContentTypeID=1Fri, 24 Jul 2020 12:07:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d6b0f7a6-5b01-47da-b5b8-b44ebc640327Heidi<p>Hi!</p> <p>This error message usually comes if you have the wrong JLink Driver version.</p> <p></p> <p>Try running nrfjprog --version in the command line to see what JLinkARM.dll version is found.</p> <p></p> <p>Best regards,</p> <p>Heidi</p><div style="clear:both;"></div>