https://devzone.nordicsemi.com/f/nordic-q-a/58744/nrf51-dongle-pca10031-firmware-overwrittenHi, I used a nRF51 dongle (PCA10031) wit the nRF Connect (v3.3.0) Bluetooth Low Energy application to communicate with a MBN52832 development kit. This works great until now. Now I always get an &quot;Error occured opening serial port. (NRF_ERROR_TIMEOUTen-USTelligent Community 13Mon, 09 Mar 2020 09:26:23 GMThttps://devzone.nordicsemi.com/thread/238743?ContentTypeID=1Mon, 09 Mar 2020 09:26:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0866e8ce-e539-46fb-b1c6-c7bc3d98a6b6Martin Krause<p>Hi Vidar,</p> <p>my PCA10031 is running again :) - thank you very much!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/238510?ContentTypeID=1Fri, 06 Mar 2020 12:02:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:141744ce-cf83-4144-9551-305d443bdb3bVidar Berg<p>Hi Martin,</p> <p>Please try an &#39;erase all&#39; with the Programmer app in nRF connect. It may be that the Dongle is programmed with the wrong FW as you said. The &#39;<span>Bluetooth Low Energy&#39; app should&nbsp;ask if you want re-program the Connectivity FW next time you run it.&nbsp;&nbsp;</span></p><div style="clear:both;"></div>