https://devzone.nordicsemi.com/f/nordic-q-a/37230/how-to-upload-the-application-code-via-ble-from-android-deviceHi Everyone I am using BLE for NORDIC UART SERVICES. I want to update my code via BLE instead of a USB or J-LINK. How can i upload my code from the Android device to nrf52840 which is using s140 device and sdk15.0 Do i have to generate a packageen-USTelligent Community 13Tue, 07 Aug 2018 13:53:22 GMThttps://devzone.nordicsemi.com/thread/143241?ContentTypeID=1Tue, 07 Aug 2018 13:53:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4c84f2df-51cf-49d1-b2b2-a670497d718fHung Bui<p>Hi Rajat,&nbsp;</p> <p>&nbsp;</p> <p>Yes you can. You just need to use our BLE DFU bootloader. You will need to generate package file. Please follow this <a href="https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader">link</a> .&nbsp;</p> <p>Currently we don&#39;t have background DFU. You would need to switch from your main code to the bootloader mode and update firmware in this mode.&nbsp;</p> <p>You can send a BLE command to switch from your application to the DFU bootloader (Buttonless).</p><div style="clear:both;"></div>