https://devzone.nordicsemi.com/f/nordic-q-a/34530/problems-when-using-ota-dfu-and-2-4ghz-rf-at-the-same-timeHi guys! I am making an application that uses the PCA10056 for 2.4Ghz RF communication using Enhenced shock burst(esb). Also, when upgrading the application, i try to use Bluetooth communication with OTA DFU. So I created a 2.4Ghz RF communicationen-USTelligent Community 13Wed, 23 May 2018 15:26:17 GMThttps://devzone.nordicsemi.com/thread/133063?ContentTypeID=1Wed, 23 May 2018 15:26:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d5d405bb-713e-453f-a0cd-7379e2b07657Hung Bui<p>Hi,&nbsp;</p> <p>&nbsp;</p> <p>You are correct, in order to use BLE DFU you would need the BLE stack (softdevice). You can use your application with the softdevice without any modification in the code. You just need to move the flash address of the application to after the softdevice. Similar to what the \examples\peripheral\blinky\pca10040\s132 does but for the S140 softdevice.&nbsp;</p> <p>You can test first with just the softdevice and the RF application. After it worked you can use BLE DFU bootloader to upload the application to the chip (instead of flashing application using programmer).&nbsp;</p> <p>Another thing you need to think of is how to put your device to bootloader mode. By default what you need to do is to hold button 4 when resetting the device.&nbsp;</p><div style="clear:both;"></div>