NRF52840 DFU with iOS phonehttps://devzone.nordicsemi.com/f/nordic-q-a/126704/nrf52840-dfu-with-ios-phoneHi, IC: nRF52840 DK: PCA10056 (for nRF52840) SDK: 17.0.2 Softdevice: s140_nrf52_7.2.0_softdevice.hex IDE: Keil C PC: Win 10 Currently, I developed a dfu firmware following the procedure given by Nordic Inc. At first, as shown below, I uploaded bootloaderen-USTelligent Community 13Mon, 26 Jan 2026 12:55:42 GMTRE: NRF52840 DFU with iOS phonehttps://devzone.nordicsemi.com/thread/559564?ContentTypeID=1Mon, 26 Jan 2026 12:55:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:19965bcc-54d8-401d-809c-a97b4ee794d7Menon<p>Hello,</p> <p>Is your application built with buttonless DFU support? Does your device successfully start advertising after entering DFU mode, and if so, what does it appear as? Have you collected any logs from the device or from the phone? If yes, do they include any messages that provide more details about the issue you are seeing? If you are just starting your development, I would recommend working with the nRF Connect SDK, as the older nRF5 SDK is now in maintenance mode.</p> <p>Kind regards,<br /> Abhijith</p><div style="clear:both;"></div>