App with DFU fail with iPhone nRFToolbox v2.1

[EL34PP]

I 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 both together and go into DFU mode.

Then, i use iPhone nRFtoolbox v2.1. I to upload but it shows "The connection has been lost". It cannot work.

After checking the help, iphone nRFtoolbox need a dat file and pack the application code and .dat file into a zip file.

I follow the instruction but it still cannot upgrade the code. Attached my .zip file. application.zip

Anything I miss during DFU? Anyone has suggestion for me?

[EL34PP]

I modify below in main.c:

define IS_SRVC_CHANGED_CHARACT_PRESENT 1

change from 0 to 1.

Re-compile the code. Check the CRC and build the zip file.

It works but there is a strange behavior.

iPhone cannot upgrade the code at the first time but it works at the second time. I test several times.

[Susheel Nuguru]

Have you had any progress with this EL34PP, this thread is almost a month old with no response.