when selecting the xiao_ble board as the target for the blinky application, application doesn&#39;t work and starts at wrong flash addresshttps://devzone.nordicsemi.com/f/nordic-q-a/97754/when-selecting-the-xiao_ble-board-as-the-target-for-the-blinky-application-application-doesn-t-work-and-starts-at-wrong-flash-addressOlder SDK 1.7 - blinky works on xiao and DK I have a xiao_ble_sense board, which I can easily program using the Segger + Nordic older SDK 1.7.1. I have tested and ran the &quot;blinky&quot; application it contains, after I changed the LED pin numbers to matchen-USTelligent Community 13Tue, 28 Mar 2023 22:22:45 GMTRE: when selecting the xiao_ble board as the target for the blinky application, application doesn't work and starts at wrong flash addresshttps://devzone.nordicsemi.com/thread/417985?ContentTypeID=1Tue, 28 Mar 2023 22:22:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b5d12de5-5688-486d-883d-1ba4530c058cZacMid007<p>Had the same problem&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/97341/external-nrf52840-board-appears-to-flash-but-won-t-do-anything">here</a>, it can also be fixed by commenting out a couple of lines</p><div style="clear:both;"></div>RE: when selecting the xiao_ble board as the target for the blinky application, application doesn't work and starts at wrong flash addresshttps://devzone.nordicsemi.com/thread/416683?ContentTypeID=1Wed, 22 Mar 2023 06:01:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7d852d7a-d02f-4853-8c81-a568897584c2ufocia<p>Glad you solved it. Just FYI, the XIAO bootloader &quot;expects&quot; an nRF5 softdevice between 0x0 and 0x27000 as shown in your screenshot.</p><div style="clear:both;"></div>RE: when selecting the xiao_ble board as the target for the blinky application, application doesn't work and starts at wrong flash addresshttps://devzone.nordicsemi.com/thread/415549?ContentTypeID=1Wed, 15 Mar 2023 16:34:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d1a0860b-d309-4bb6-b229-79982f2074dfkobyfr<p>solved it, by creating a copy of the xiao_ble board definitions, and overwriting the flash definition parts.</p> <p>Indeed the flash division seems to match the Arduino bootloader&nbsp; requirements.</p> <p>I&#39;ve set the application to start at address 0, instead of the 0x27000 address.<br />Attaching the board definition files I&#39;ve copied and modified:</p> <p>,<a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/xiao_5F00_ble_5F00_sense.zip">devzone.nordicsemi.com/.../xiao_5F00_ble_5F00_sense.zip</a></p><div style="clear:both;"></div>