https://devzone.nordicsemi.com/f/nordic-q-a/65954/programming-custom-nrf52811-boards-based-on-fanstel-module-bm833afI have a Fanstel Evaluation board which can be programmed through 52 DK board, no problem there and i also have built a custom board using the BM833AF modules based nRF52811,the issue i&#39;m having is that few are booting up with factory default firmwareen-USTelligent Community 13Wed, 16 Sep 2020 14:16:49 GMThttps://devzone.nordicsemi.com/thread/269911?ContentTypeID=1Wed, 16 Sep 2020 14:16:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fefd587e-a517-4699-b4fd-74df94355092Paul Canon<p>Hello,<br />the voltage is correct when it is powered through DK, the reset pin is connected to a Push button, when the button is pressed it is pulled to GND otherwise it is left floating. i will try shorting reset pin to VDD and try to connect to nrfjprog and will update status here</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/269907?ContentTypeID=1Wed, 16 Sep 2020 14:03:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c7eb27ac-a46a-4149-8517-cf9ed1d71891J&#248;rgen Holmefjord<p>Hi,</p> <p>I would still think this is caused by some board/assembly issue. Is the voltage of the board correct when it is powered by the DK? Is the reset pin connected to anything on the custom board? Can you try to short the reset pin to VDD before doing a recover/erase operation with nrfjprog?</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>