https://devzone.nordicsemi.com/f/nordic-q-a/7814/app-with-dfu-fail-with-iphone-nrftoolbox-v2-1I am using nRF51822-QFAA_Rev2. S110 7.1.0, SDK6.1.0. First, program bootloader, then program \s6310\s110\ble_app_hrs\arm\ble_app_hrs_dfu code. I use Android nRFtoolbox v1.14.0 and it can upload the code at any moment. It automatically connect bothen-USTelligent Community 13Tue, 28 Jul 2015 10:58:59 GMThttps://devzone.nordicsemi.com/thread/27821?ContentTypeID=1Tue, 28 Jul 2015 10:58:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ddaa439d-ef49-4238-872f-27dcdcd532b1Susheel Nuguru<p>Have you had any progress with this EL34PP, this thread is almost a month old with no response.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/27820?ContentTypeID=1Wed, 24 Jun 2015 14:13:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b968602b-1445-43b0-b597-7601f7355f13EL34PP<p>I modify below in main.c:</p> <p>define IS_SRVC_CHANGED_CHARACT_PRESENT 1</p> <p>change from 0 to 1.</p> <p>Re-compile the code. Check the CRC and build the zip file.</p> <p>It works but there is a strange behavior.</p> <p>iPhone cannot upgrade the code at the first time but it works at the second time. I test several times.</p><div style="clear:both;"></div>