https://devzone.nordicsemi.com/f/nordic-q-a/94704/how-to-dfu-nrf52832-via-ble-using-esp32Hi, I&#39;m a beginner to this kind of problem. I am trying to update firmware for nRF52832 through BLE using ESP32. I am using 17.1 SDK and Softdevice 7.2.0 with Keil. I have gone through some thread related but cant figure out the way to deal with theen-USTelligent Community 13Fri, 09 Dec 2022 14:11:44 GMThttps://devzone.nordicsemi.com/thread/399957?ContentTypeID=1Fri, 09 Dec 2022 14:11:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4d56b609-ea1a-4d78-b01c-678535ac89eaJ&#248;rgen Holmefjord<p>Hi,</p> [quote user=""]1. The&nbsp;Buttonless DFU example does the regular application until it enters the DFU mode by nRF connect app right?[/quote] <p>Yes, this examples implements the buttonless DFU service on BLE and allows you to enter the bootloader to perform DFU from the application/over BLE.</p> [quote user=""]2. How to implement the DFU master code on a microcontroller with BLE?[/quote] <p>Unfortunately, we do not have any examples showing how to perform DFU over BLE from an external BLE DFU server. We do have an unofficial example of serial DFU master in <a href="https://devzone.nordicsemi.com/guides/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader#h108sjziaxo3m81rkgr1has5r1d72qtu">this blog post</a>, and you can find the documentation for the <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_dfu_transport.html">DFU protocol in the SDK documentation</a>. A customer have also posted some instructions on how to do this in <a href="https://devzone.nordicsemi.com/f/nordic-q-a/71858/problems-in-transfer-of-a-firmware-image">this ticket</a>, which might help you get started with your own implementation. Our main BLE DFU master solution can be found in python in <a href="https://github.com/NordicSemiconductor/pc-nrfutil/blob/master/nordicsemi/dfu/dfu_transport_ble.py">pc-nrfutil source code</a>.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>