https://devzone.nordicsemi.com/f/nordic-q-a/59478/nrf52dk-pca10040-problems-after-updating-jlink-firmwareHi, I updated Segger Embedded Studio to the latest version, 4.50, after that it asked me to update JLINKv6.62a firmware update, but there after I had problems with the board, like SES hangs while debugging, USB to UART is too slow or not respondingen-USTelligent Community 13Mon, 30 Mar 2020 14:35:47 GMThttps://devzone.nordicsemi.com/thread/242483?ContentTypeID=1Mon, 30 Mar 2020 14:35:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:914f3151-004c-43a0-978f-830df97afbe3Martin Lesund<p><a href="https://devzone.nordicsemi.com/f/nordic-q-a/24592/my-nrf52-nrf51-dk-kit-doesn-t-work" rel="noopener noreferrer" target="_blank">Check out step 4 in this thread.</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/241824?ContentTypeID=1Thu, 26 Mar 2020 12:22:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c69cc13d-8e6f-4fdb-9a75-d17945035c5cRos<p>Thanks for the reply, meantime can you suggest where I can find the latest boot-loader?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/241635?ContentTypeID=1Wed, 25 Mar 2020 15:35:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e856291b-2422-4fc7-aa80-5ca80d17abc2Martin Lesund<p>Hi Ras,<br />I will try to reproduce this issue.<br />I would recommend you to downgrade to a stable SES + Jlink version.</p><div style="clear:both;"></div>