https://devzone.nordicsemi.com/f/nordic-q-a/84497/flashing-zephyr-project-over-dfuI made a DFU Bootloader for my nrf51822 that waits for two seconds before starting the application, so I have time to connect and flash. That process was working with the nRF SDK, but I fail to flash a zephyr project. I am using the nRF-connect-sdken-USTelligent Community 13Wed, 09 Feb 2022 12:57:04 GMThttps://devzone.nordicsemi.com/thread/352071?ContentTypeID=1Wed, 09 Feb 2022 12:57:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:37e4b16a-4e62-4681-9b0c-11159e378224tesc<p>Hi,</p> <p>There are several large differences between nRF5 SDK and nRF Connect SDK, both in BLE stack, DFU, boot process and flash layout. This means we do not have an upgrade path from nRF5 SDK based projects to nRF Connect SDK based projects.</p> <p>In order to put a zephyr based project onto a device with an nRF5 SDK based project, I am afraid you must connect to the SoC with a J-Link programmer.</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>