https://devzone.nordicsemi.com/f/nordic-q-a/100131/stuck-on-initial-ldr-commandhello, I made 10 boards this time. 9 of them work normally... he other one stops at the initial ldr as shown in the capture below. Seeing that 90% of the board operates normally, it seems to be a HW type solder problem. Judging by the problemen-USTelligent Community 13Thu, 25 May 2023 11:53:32 GMThttps://devzone.nordicsemi.com/thread/427512?ContentTypeID=1Thu, 25 May 2023 11:53:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fdc46dcd-c33b-45e1-ac80-247d0da2b7fbEdvin<p>Hello,</p> <p>Glad you found the cause, if you did. FYI, when the application stops at 0xA60, like it did in your screenshot, it means that it has stopped in the hardfault handler. If you want to dig deeper into what happened, you can add the hardfault handler to your application, and look at what instruction that led to the hardfault. It is difficult to say what it is without debugging. Perhaps some bad connection caused a &quot;divide by zero&quot;? It can also be caused by some bad pointers, if you try to access protected flash, or restricted peripherals (restricted by the Bluetooth stack, for example).</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/427476?ContentTypeID=1Thu, 25 May 2023 10:35:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d04a50ab-32c2-4f10-892b-1303d83a15e0pkr2258<pre id="tw-target-text" class="tw-data-text tw-text-large tw-ta" dir="ltr"><span class="Y2IQFc" lang="en">I found the cause. Only the one that was problematic, another nRF52 series IC was used.</span></pre><div style="clear:both;"></div>