https://devzone.nordicsemi.com/f/nordic-q-a/3380/programming-nrf51822-using-uart-i2cHi, We are using nRF51822 in our custom board. nRF51822 is interfaced with a MCU using UART. We want to load firmware image in MCU which will then flash nRF51822 via UART. How to set nRF51822 in programming mode? what signal sequence or pinen-USTelligent Community 13Wed, 06 Aug 2014 10:43:07 GMThttps://devzone.nordicsemi.com/thread/12288?ContentTypeID=1Wed, 06 Aug 2014 10:43:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:caef5f9b-2b9b-4976-a3b9-cae5309cd70bVidar Berg<p>No problem. But it is not possible to order pre-programmed chips from Nordic.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/12287?ContentTypeID=1Wed, 06 Aug 2014 09:31:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9b1f0f0d-150d-4a79-9f87-dc927ad76822Aashish Patel<p>Thanks for quick response.</p> <p>One more thing.</p> <p>Can we get/order nRF51822 chips pre-programmed with DFU bootloader ?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/12286?ContentTypeID=1Wed, 06 Aug 2014 07:29:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f47344b9-8416-4f2a-b2b1-8eba12fcabf6Vidar Berg<p>Hi,</p> <p>The SWD interface is required when programming blank devices and there is unfortunately no way around it as far as I know. I would suggest to use the SWD for the initial firmware including the bootloader to enable future programming over UART.</p><div style="clear:both;"></div>