https://devzone.nordicsemi.com/f/nordic-q-a/53194/how-to-upload-firmware-on-nordic-nfr52840-pca10056-via-uartI want to know the upgradation process of firmware (Zephyr OS) on nordic nrf52840_pca10056. I have flashed the Zephyr OS on chip once via Jlink/JTAG, and now I want to flash it over UART from host processor. How I should start the process? I have referreden-USTelligent Community 13Mon, 14 Oct 2019 11:30:48 GMThttps://devzone.nordicsemi.com/thread/214801?ContentTypeID=1Mon, 14 Oct 2019 11:30:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c532b027-9d95-4455-8c5c-38159ca5bdc5H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>I&#39;m sorry but&nbsp;<a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.0.0/nrf/index.html">nRF Connect SDK</a>&nbsp;does not support nRF52840, only nRF9160. To use Zephyr samples on nRF52 series, please&nbsp;<a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/getting_started/index.html#getting-started-guide">follow this guide</a>. More information can be&nbsp;<a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/nrf5x-support-within-the-zephyr-project-rtos">in this link</a>, and as stated in the bottom of the page: &quot;<em>Also if you want to get involved with Zephyr, or simply need help as a user, you can join the Zephyr&nbsp;<a href="https://lists.zephyrproject.org/mailman3/lists/">mailing list</a>&nbsp;or join the #zephyrproject IRC channel.&quot;</em></p> <p>Nordic Semiconductor is part of the&nbsp;<a href="https://www.zephyrproject.org/what-is-zephyr/">Zephyr Project</a>&nbsp;and contributes with misc. components/software, but we do not give support for Zephyr running on nRF52840.&nbsp;&nbsp;</p> <p>Thanks for your understanding.</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>