https://devzone.nordicsemi.com/f/nordic-q-a/34995/uart-bootloaderHi, in our application we will have a main MCU and a second MCU, an nrf52832. We need to update the fwon the nfr52832 from the main MCU using a bootloader, via UART. I&#39;d like to have an estimation of how long will take via UART to erase the fladhen-USTelligent Community 13Fri, 01 Jun 2018 11:32:50 GMThttps://devzone.nordicsemi.com/thread/134343?ContentTypeID=1Fri, 01 Jun 2018 11:32:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ed6753f4-7d95-4856-a9bc-eb98bde73885Hung Bui<p>Hi Emanuele,&nbsp;</p> <p>The UART baurate used is&nbsp;115200 bps by default.&nbsp;</p> <p>With that speed, test on nrfutil showed it took about 5.3 seconds to transfer DFU image of an application of 40kB.&nbsp;</p> <p>In your setup with 2 MCU you should have similar result compare to nrfutil. You can use that tool to estimate what you will have when you have your DFU master MCU.&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p><div style="clear:both;"></div>