https://devzone.nordicsemi.com/f/nordic-q-a/77374/programming-nrf52840-fails-during-writing-after-a-random-amount-of-timei have a custom board with an nrf52840, i use a J-link programmer to flash the chip with the nrf connector programmer app. I am able to read the memory and erase the chip, however when i try to write any hex to the device it fails with an error. whenen-USTelligent Community 13Mon, 12 Jul 2021 12:02:36 GMThttps://devzone.nordicsemi.com/thread/319582?ContentTypeID=1Mon, 12 Jul 2021 12:02:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9651adca-99e3-4dbf-b4e4-845c4e2b09b8Karl Ylvisaker<p>Hello,&nbsp;</p> [quote user=""]I am able to read the memory and erase the chip, however when i try to write any hex to the device it fails with an error. when using j-flash lite it also fails most of the time but the point where it fails is random and in rare cases it doesn&#39;t fail though this chance decreases as the hex size increases.[/quote][quote user=""]on a dev board with the same chip and everything connected in the same way it flashes successfully so i suspect a hardware issue.[/quote] <p>This makes me suspect a hardware issue as well. Which debugger are you using, and how is it connected to the SoC on the custom board? Please be as specific as possible.<br />Have you been able to successfully program your custom board previously? If so, is there any difference between the setups used then and now?</p> [quote user=""]it also fails most of the time but the point where it fails is random and in rare cases it doesn&#39;t fail though this chance decreases as the hex size increases.[/quote] <p>Erasing and writing takes significantly longer than just reading the memory, so this also points in the direction of a hardware issue.&nbsp;<br /><br />Best regards,<br />Karl</p><div style="clear:both;"></div>