https://devzone.nordicsemi.com/f/nordic-q-a/66338/update-bootloader-ota-with-bigger-sizeHi, I work on a project quite advanced as our product is already in the hands of some of our clients. My problem is that we would like to add some feature to our bootloader. The main feature is to add the possibility to use our LED driver from the bootloaderen-USTelligent Community 13Fri, 25 Sep 2020 13:20:27 GMThttps://devzone.nordicsemi.com/thread/271541?ContentTypeID=1Fri, 25 Sep 2020 13:20:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9ffba641-a51e-4e15-b3df-3f9377b15734lcalvez<p>Tank you, that is what i understood but I just wanted confirmation.<br /><br />I will try to find another solution then.<br /><br />Best regards,<br /><br />Loick</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/271540?ContentTypeID=1Fri, 25 Sep 2020 13:18:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6153ced5-3ed4-4cb5-8ac8-91f648de8c9cEdvin<p>Unfortunately it is not possible to update the bootloader start address through a DFU update. You need to reflash the device. The reason for this is that the Bootloader start address is stored in UICR, which you can&#39;t update from the application on the nRF52840. I am sorry. It is probably not the answer you were hoping for, but it is the way it works.</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>