https://devzone.nordicsemi.com/f/nordic-q-a/61623/difference-between-debug-dfu-projects-and-non-debug-onesHello, For the secure bootloader example there are various included projects supporting the different hardware ICs (ex: nRF52832 or nRF52840) and the different transports (uart vs. ble). However, each configuration has a debug and non-debug versionen-USTelligent Community 13Wed, 20 May 2020 11:48:25 GMThttps://devzone.nordicsemi.com/thread/250943?ContentTypeID=1Wed, 20 May 2020 11:48:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b7938690-cd0f-4a27-b02c-5d953937d3b7Turbo J[quote userid="88358" url="~/f/nordic-q-a/61623/difference-between-debug-dfu-projects-and-non-debug-ones"]why create a whole new project?&nbsp;[/quote] <p>Simple answer: The DEBUG bootloader is <em>much</em> larger than the non-debug one and thus requires a different linker script.</p> <p>Also you cannot change the bootloader start address with normal DFU, and thus cannot switch between these versions due to the size difference. Switching between different size bootloaders requires SWD connection.</p><div style="clear:both;"></div>