DFU - problem updating a BL of a different size (and different starting address)https://devzone.nordicsemi.com/f/nordic-q-a/47257/dfu---problem-updating-a-bl-of-a-different-size-and-different-starting-addressHallo I&#39;m using sdk12 , S130 on NRF51822, so far successfully updated application, soft device and BL, however lately after changing the size and starting address for the DFU the BL software fails to update itself and not even returns to BL stateen-USTelligent Community 13Tue, 14 May 2019 12:22:13 GMTRE: DFU - problem updating a BL of a different size (and different starting address)https://devzone.nordicsemi.com/thread/186964?ContentTypeID=1Tue, 14 May 2019 12:22:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:eacd9be9-6e29-494d-8f6c-8ff994ad3491Einar Thorsrud<p>Hi,</p> <p>Changing the bootloader size via DFU is not supported. Even if you were able to copy the larger bootloader in place, it still would not work as the MBR will branch to the bootloader address that is specified in UICR. And the UICR cannot be programmatically deleted (to be updated) on the nRF51, so there is absolutely no way you can achieve this with Nordic&#39;s DFU solution.</p><div style="clear:both;"></div>