https://devzone.nordicsemi.com/f/nordic-q-a/11325/nrf52-fota-mbed-hardwareHello Nordic Community,, Do I need the typical MBED hardware setup (Interface chip connected to &#39;target&#39; (the nrf52)) in order to program the nrf52 with FOTA using an MBED generated .hex file? Or is the interface chip not used during FOTA with MBEDen-USTelligent Community 13Fri, 15 Jan 2016 08:45:02 GMThttps://devzone.nordicsemi.com/thread/42594?ContentTypeID=1Fri, 15 Jan 2016 08:45:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81d644d9-57fe-4a56-8ffb-82285b0dc1eaMichael Dietz<p>When updating firmware over the air the interface MCU will not be used. However the nRF52 on your board will have to be pre programmed with a softdevice and bootloader application. Once there is a valid softdevice and bootloader application you shouldn&#39;t need an interface MCU. And I&#39;m not sure about mbed&#39;s OTA capabilites but you may be only able to update the application or you may be able to update the bootloader, softdevice and appliation over the air.</p><div style="clear:both;"></div>