https://devzone.nordicsemi.com/f/nordic-q-a/2725/how-to-change-the-start-address-of-the-bootloaderHi: I want to add some code to the nRF51822 bootloader.But lack of code space. Whether I can modify the start address of the bootloader??en-USTelligent Community 13Tue, 10 Jun 2014 02:21:02 GMThttps://devzone.nordicsemi.com/thread/10596?ContentTypeID=1Tue, 10 Jun 2014 02:21:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1f0f7728-13ec-4f1e-a05e-674cbe937ad4jixing.zou<p>Hi I found #define NRF_UICR_BOOT_START_ADDRESS (NRF_UICR_BASE + 0X14), this is the bootloader start address stored in UICR_FWID register. So I want to change it. I found SoftDevice always set it to 0x0003c800. Even if you changed it, softdevice will reset it to 0x0003c800.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/10595?ContentTypeID=1Mon, 09 Jun 2014 12:06:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:01a1773f-90ee-4948-b65e-b3f4b591844dJohn<p>At a minimum you will need to change:</p> <ol> <li>The IROM1 start and size setting is in the project options window, target tab.</li> <li>The #define BOOTLOADER_REGION_START in dfu_types.h</li> </ol> <p>There may be others, but these are the ones that I am aware of.</p><div style="clear:both;"></div>