https://devzone.nordicsemi.com/f/nordic-q-a/39530/how-to-reject-buttonless-dfu-attemptHi, Is there a way to reject a buttonless DFU attempt (nRF52832, SDK14.2) ? I want my application to allow DFU only when certain conditions are met. I thought using case BLE_DFU_EVT_BOOTLOADER_ENTER_PREPARE: in ble_dfu_evt_handler(). Howeveren-USTelligent Community 13Wed, 17 Oct 2018 14:06:38 GMThttps://devzone.nordicsemi.com/thread/153270?ContentTypeID=1Wed, 17 Oct 2018 14:06:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a86e3e4-6609-4426-bc92-ce95f9e5038cbjorn-spockeli<p>Hei eyalasko,&nbsp;</p> <p>Yes, the&nbsp;ble_dfu_evt_handler is only used to notify the application which state the DFU Service module is in, there&#39;s no events that needs to be confirmed etc. So I am afraid that you will have to modify the DFU service implementation to do this.&nbsp;</p> <p>You should be able to check if the conditions are met when the&nbsp;DFU_OP_ENTER_BOOTLOADER opcode is written to the Buttonless DFU Control point, see&nbsp;ble_dfu_buttonless_on_ctrl_pt_write() in ble_dfu_unbonded.c or&nbsp;<span>ble_dfu_bonded.c if you support bonds.&nbsp;</span></p> <p><span>Best regards</span></p> <p><span>Bjørn</span></p><div style="clear:both;"></div>