Hi,
I uploaded the app to the kit as I have been doing it for the last 2 months and from now there is no way to get back to advertising mode. Before, I used the nRF Master Control Panel in order to up lead the app code, I pressed the appropriate switch and when the kit's led glowed in green I was able to connect to it to upload the app code. I used a Samsumg Galaxy S3, and now a LG G3 and I noticed a faster upload than before but the kit doesn't advertise now and only is in Dfu mode. I'll try with my old S3 at home but... I don't understand very well why this is happening.
Regards
Iván Gómez