https://devzone.nordicsemi.com/f/nordic-q-a/22913/dfu-error-with-iosWe use IOS DFU toolbox to upgrade firmware with BLE device. we can upgrade successfully with Android, but always failed with IOS. wrong code is: DFUErrorReadingVersionFailed. My device name is HERTZ-ARDK.. Is there anyone can solve this problem? Thanksen-USTelligent Community 13Wed, 21 Jun 2017 14:55:21 GMThttps://devzone.nordicsemi.com/thread/90130?ContentTypeID=1Wed, 21 Jun 2017 14:55:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6e62016f-184a-417c-8973-1bd7e8a88d6eHung Bui<p>Could you answer my questions ? Have you tried to change the address of the bootloader ?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/90129?ContentTypeID=1Wed, 21 Jun 2017 02:04:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:94eadb6c-3083-4f69-96af-ecffe9522adeeric<p>thanks!we use sdk7, and we have included service changed characteristic IS_SRVC_CHANGED_CHARACT_PRESENT = 1 .</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/90128?ContentTypeID=1Tue, 20 Jun 2017 13:22:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8946077c-911d-4bb8-a6ca-7d4993bcaed3Hung Bui<p>@Eric: could you give some more information about your setup ? is the <strong>HERTZ-ARDK</strong> running your application and is the buttonless DFU application, so that you can switch to the bootloader from the app ? Or it&#39;s the bootloader advertise as HERTZ-ARDK ?</p> <p>I suspect that it was the cached ATT table issue, that when you switch to DFU the iphone still thinks that you are the HERTZ-ARDK and have problem reading the DFU version.</p> <p>Do you use bonding ? If you are using SDK v11 and earlier have you included service changed characteristic IS_SRVC_CHANGED_CHARACT_PRESENT = 1 ?</p> <p>Which SDK version are you using ?</p><div style="clear:both;"></div>