https://devzone.nordicsemi.com/f/nordic-q-a/26806/mbr-set-gpio-pinI&#39;m using the SD (nrf52) MBR to update our custom bootloader, in a battery powered device.We have some custom hardware which is used to disable our LDO, to enter a &quot;Ultra Low Power&quot; Shipping Mode, this is controlled by a GPIO. As you can imagine, turningen-USTelligent Community 13Tue, 14 Nov 2017 13:18:02 GMThttps://devzone.nordicsemi.com/thread/105355?ContentTypeID=1Tue, 14 Nov 2017 13:18:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:59f6851d-7950-4fd4-bfd9-98e447bd6243ovrebekk<p>Hi</p> <p>Are you able to provide a schematic of your custom hardware?</p> <p>The problem is that the MBR is activated by running a soft reset, which means that even if we changed the MBR to set the pin it would still be undefined during the soft reset. If you could have an external pull up to keep the pin high during reset then that might solve that particular issue, but then you might not be able to keep the pin low trying to disable the LDO (hard to say without knowing more about your hardware).</p> <p>Best regards</p><div style="clear:both;"></div>