https://devzone.nordicsemi.com/f/nordic-q-a/63051/buttonless-dfu-disconnectHi, I am trying to perform Buttonless DFU on a nrf52832 chip. I am using SES on Windows. I do DFU with nrfToolbox on my iPhone. The way I do it is by packaging the DFU bootloader, the SoftDevice and the buttonless app. After flashing it in a PCA10040en-USTelligent Community 13Mon, 06 Jul 2020 19:04:40 GMThttps://devzone.nordicsemi.com/thread/258679?ContentTypeID=1Mon, 06 Jul 2020 19:04:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d44f08c8-6936-4c55-b222-6808b2204190JayLynkz<p>Hi Hung !</p> <p>Thanks for your answer. I ended up deleting the &#39;buttons_leds_init(&amp;erase_bonds);&#39; when uploading in my custom board and it works fine. Seems like I don&#39;t need the &#39;delete_bonds&#39; function..&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/257069?ContentTypeID=1Fri, 26 Jun 2020 09:06:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:91b1d703-5236-460b-a10f-572d73a2c69dHung Bui<p>Hi Jerome,&nbsp;</p> <p>Do you use any bonding in your application ?&nbsp;<br />Please try testing with bonding erased both your device and on the phone.&nbsp;<br />In addition, please make sure&nbsp;NRF_SDH_BLE_SERVICE_CHANGED =1 in sdk_config.h so iPhone would do a service discovery when switching to the bootloader.&nbsp;</p> <p></p> <p>If you still have the issue, you would need to debug and check if either the application crashes or the bootloader crashes when you connect. It&#39;s most likely the reason why the phone showed &quot;&nbsp;<span>Device failed to connect&#39;</span></p><div style="clear:both;"></div>